题目内容
What students can do?Computers:Use computers during lecture, but only to 1. _____ 2._____.Cell phones:Put cell phones 3.______ .
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What students can’t do?Computers:Watch 1._______ 2.______.Cell phones: Send or read 3._____ 4.______ or look at Facebook.
Consequences of breaking rulesComputers:Students won’t be allowed to use computers for the 1.________ of the semester.Cell phones:The professor will 2.______ the cell phone and 3.______ until the end of class.
形成投影的三要素有( )、物体和投影面。
正投影法的三个基本性质有真实性、积聚性和( )。
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