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第1题

2．试讨论利用光栅的摩尔条纹特点如何来检测机床移动部件的位移、移动方向和移动的速度？
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第2题

He received a(n) _______ call threatening to disclose details of his affair if he didn’t pay the money. A、anonymous B、
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第3题

In the _______ of research, it is an accepted fact that scientific publications have to be written or translated into En
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第4题

Praise must be used wisely to _______ students who perform up to expectations and to encourage students to perform to ma
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