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On this day, Erniu Zhilu said to Leeuwenhoek, the chief said that he was one of the thousands of sages in the upper realm, and it was he who invented a practical microscope, which was a metal microscope that could be magnified to 300 times, and "Levzi" used it to observe protozoa, protozoa is very common, and it is very relevant to humans, because it can cause some diseases such as malaria, etc., and "Levzi" He is also the first person to really discover the existence of "bacteria".

On this day, although Er Niu was still a little strange that this person in the world was still surnamed "Hook", this did not prevent him from setting up an ideal, that is, to be a "biologist" like "Levzi".

Because it was on this day that he walked into a small world world that was shown by a microscope. This small world was colorful, and there he saw many things that they could not see, but which were very beautiful. Moreover, this small world is still full of wisdom, and they can learn a lot of knowledge that cannot be learned in textbooks.

In that small world, he found a few insects like the soles of shoes in the clear water taken from the puddle, and the chief told them that it was called paramecium, and it only had 0. 05 mm long, people can only see them with the naked eye are small white dots, with a magnifying glass can see them swimming, and only with this microscope, can they see their true face of Lushan.

In this world, he also saw a small piece of clean white paper, when the chief asked them to touch it with their hands, they felt that it was not only very flat but also very smooth, and the chief let them look at it, it looked very clean, but when they began to look at it with a microscope, they found that the surface of the paper was undulating like a hill, continuous, thousands of ravines, and many small black spots.

It was also in this world that he saw the dust in the room, the crystals of sea salt, the sprouting radish seeds, and the fibers of silk......

"Erniu, do you really want to be a 'biologist'?" Meizi had a lollipop in her mouth and asked Erniu, who was walking beside her.

Erniu touched his head "hehehe", "Well, I must be a biologist when I grow up!" Ever since he heard from the chief that anyone who takes life as the object of study, they can all be called biologists, and they all have to work with this microscope, and the infinite charm that the little world world has shown him, he has made this wish.

"But it will be very bitter, the chief has said that to do this work, you have to go to the deep mountains and old forests often, and what kind of seaside desert and so on."

"I'm not afraid ......"

……

"You see that the children have their own lofty ideals." Huang Shi stood by the door and looked at the children who were gradually moving away, turned back to Hong'er and Meiling and said, he was a little emotional, the more innocent the age, the higher the ideal, just like when he was young, he also aspired to be a scientist.

Although he, like that Erniu, does not know that the Daoist scientist is just a general term, just like a biologist, because biology can be divided into zoology, botany, microbiology, etc., so biologists can be divided into zoologists, botanists, microbiologists, etc. According to the content of life activities, they are divided into ecologists, physiologists, geneticists, cell biologists, molecular biology and systems biologists.

In his time, although there were not many options that children could think of, except for scientists, mathematicians, PLA soldiers, police uncles who could be reached, doctors, painters, engineers, etc., but at least they were hard-working builders. is not like the later frivolous era, in addition to getting rich is fighting for a father, more children just want to be a star and live a life where tens of thousands of people are in the limelight and so poor that they only have money left.

Seeing Meiling and Hong'er looking at him with some puzzlement, Huang Shi sighed, but he didn't explain, he turned around with his hands behind his back, raised his head and said, "Ling'er, this microscope will be placed here for you in the future, you have to keep it away." ”

Meiling nodded in response.

Huang Shi was thinking about what he could do with this microscope worth more than 20,000 yuan just now, but he thought about it, as if it could only be used to observe microorganisms, and by the way, popularize common sense of hygiene, and the others were really not needed for a while, so he could only let Ling'er collect it first.

"By the way, these are all ways to talk about how to maintain it, you take it and see for yourself first." Huang Shi took out a bunch of instructions from the box and handed them to Meiling.

After Meiling answered, he turned his head to Hong'er and said, "You just said that those pools have been built?" ”

"Yes, chief, in the morning, Mr. Li came to say, he said that the five pools have been built with bricks, and they can be plastered with cement mortar in the next two days."

"Okay, great." Huang Shixin said that it has been almost two weeks, and they have finally finished it, so they can build a brick and concrete canteen first, and if the canteen can be built, then they can build a small five- or six-story house with a frame to test the water, so as to prepare for the construction of a residential community.

In that case, you have to cheer them up, and by the way, check the quality of their construction, thinking of this, Huang Shi said, "Then let's go see them." ”

……

"Chief, look ......" Li Chengpeng led the pools of Huangshi to inspect the past, and the successful completion of this project made him feel very glorious as a supervisor.

"Okay, I'll see for myself." Huang Shi nodded, walked to the largest cistern, and walked down the steps to the pool, which had been dug three meters deep and then two meters above it, and finally became a five-meter-high pool.

Looking at the neatly stacked bricks and ash joints, Huang Shi nodded with satisfaction, he just looked at the pools one by one, and found that the construction level of the engineering team is indeed constantly improving, the first two pools, their ash joints are still a little uneven, but in this large pool, it is obvious that there is no such situation.

This time the pool was built according to Huangshi's requirements for plum blossoms, which made Lao Gan very incomprehensible at the beginning, but Huangshi remembered what Jiang Hualong said to himself, so he insisted, although the efficiency was much lower and the work efficiency was relatively slow, but the effect in exchange was of good quality.

Originally, most of the brick walls were one and the same, and the upper and lower masonry joints were all staggered, but this is only 24 walls, which is commonly known as a brick wall. The pool is generally strictly protected from water leakage, so it is built with 48 walls of two bricks, and it is divided into Shun and Ding on the plane.

The so-called Shun and Ding, from the view of the wall, the long direction is Shun, and the short direction to the wall is Ding. The more the gaps are staggered, the less likely it is to leak, such as septic tanks and small pools, which are 48 walls, not only requiring the vertical to be a smooth one, but also the plane to be a smooth one. The pool facing Yellowstone is made of 72-walled masonry, which is almost of the highest standard.

Jiang Laogan and Niu Dali, who were following behind Huang Shi, happily watched the chief patting the wall they had built while walking and said, "Good, good, very good." ”

"Chief, can we plaster the surface with cement mortar?" Niu Dali saw Huang Shi's satisfied look, so he stepped forward and asked.

Nodding, Huang Shi replied, "Okay, no problem, but you must take care of the sand matter, and you can't lower the standard for me." ”

It turned out that Huangshi bought several carts of red bricks and cement for these pools, but the sand was not bought much at that time, and the amount of sand was relatively large, but Huangshi didn't have time for the engineering team to pull sand, so he thought about whether he could use the sand on the seaside, so he had to run to Jiang Hualong for advice.

"Sand, you're on an island, and it's basically sea sand, so you can only make do with it."

"Is there nothing wrong with the sea sand?" Hearing Jiang Hualong say this, Huang Shi himself had doubts again, because he remembered that Luo Jialiang's father in the Hong Kong TV series "Genesis" seemed to be because of the use of sea sand in the building, which was exposed by the media, and then arrested and imprisoned for more than ten years, and the family road has since fallen.

"Of course, there is a problem, if you use sea sand in the building, the walls will be moss, the window sills will grow weeds, the houses will be hung with 'stalactites', and the buildings will be 'tattooed'."

Huang Shi was startled, feeling that Lao Jiang was inconsistent, "There is a problem, then you still let me use it?" ”

"You're not a permanent high-rise building, you're just building a few temporary reservoirs, and you have to know that the price of this river sand is six or seven times that of the sea sand, and you have to transport it from the mainland, so I'm afraid the cost of this sand will be sky-high."

"By the way, Lao Jiang, why can't you use sea sand for this building?" Huang Shi remembered that Lao Jiang didn't know about Lu Dao's Guangmen, but where was the danger of sea sand, he had to ask it clearly.

With Jiang Hualong's narration, Huangshi realized that sand is a necessary material in cement mortar. If there is no sand in the cement mortar, then the solidification strength of the cement mortar will be almost zero.

From the specifications, the sand can be divided into fine sand, medium sand and coarse sand. The particle size of the sand is 0. 25-0。 35mm is fine sand with a particle size of 0. 35-0。 5mm is medium sand, greater than 0. 5mm is made of coarse sand. In general, it is recommended to use medium sand in home decoration.

From the source, the sand can be divided into sea sand, river sand and mountain sand. In architectural decoration, the state strictly prohibits the use of sea sand. Although the sea sand is clean, it has a high salinity content, which has a great impact on the quality of the project. To distinguish whether it is sea sand or not, the main thing is to see whether the sand contains small marine shells.

Due to the rough surface, the cement adhesion effect is good, but the composition of mountain sand is complex, and most of them contain soil and other organic impurities. Therefore, in general decoration projects, it is recommended to use river sand. The surface roughness of the river sand is moderate, and it is relatively clean, containing less impurities. Generally, the sand purchased from the market has to be screened with a net before it can be used.

Jiang Hualong said later, "Because the sea sand contains harmful ingredients such as chlorine and alkali, the rust of the steel bar is very large. Moreover, it will reduce the viscosity of cement and cause hidden dangers in the quality of the project. ”