The current scientific and technological level of Chengjiacun can be said to be at the forefront of the world, at least in Cheng Runnian's eyes, everything is complete, enough to start qualitative changes.

In the original world, the first industrial revolution was the application of the steam engine, and the second was the motor.

The steam engine is not difficult, but the volume is ......

"Why Does the Emperor Always Want to Cut Me" Chapter 194 What a big pie is being hit by hand, please wait a moment,

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