题目内容
In ancient times• Zhaozhou Bridge is the earliest and best-preserved 1) ____________________________in the world.• The four great inventions – 2) ________________________________________________ – changed the appearance of the world.• China’s global firsts also include 3) _____________, oil wells, etc.
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In modern times• China has deployed the world’s 1) _______ ultra-high voltage AC and DC lines.• China’s 2) _________________ technology has reached 3) ______________________ and has been exported to other countries.China’s coal technologies have allowed for 4) _________________ and more efficiency.• China has invested a lot in 5) _____________ and new-energy vehicles.• China has the world’s 6) ____________ supercomputer, with its processors designed and made in 7) ____________.• China’s space program has been progressing 8) ______________.
Check the things which are in the speaker’s childhood room.
表达零件内部结构时，对称类零件宜采用（ ）视图。
表达零件内部结构时，内部复杂的零件宜采用（ ）视图。
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