Cao Xiu looked through it carefully several times, and couldn't find a problem at all except for some side details. Zhang Han's idea is not much different from that of later generations, as long as it is designed according to the drawings, it will never be a problem.

Then, he put the drawings down.

"Zhang Jun has made a great contribution to the Qin country!"

"Seriously?"

"Of course!"

Cao Xiu stood up and flipped through the bookshelf for a long time before taking out two rolls of silk silk. I blew it down, and there was it all of a sudden

"Da Qin: Picking Up the Eight-Year-Old First Emperor at the Beginning" Chapter 256 Great Inventor, It's up to you! I am hitting it in my hand, please wait a moment,

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