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问题
多项选择题
测站归心和照准归心投影的示误三角形边长,分别不超过( )mm。
A.5
B.10
C.15
D.25
E.20
答案
参考答案:
A,B
填空题
走近成龙。(选择合适介词填空)
to in on at
I want to send a letter ____
1
___ Jackie Chan. First, I write a letter ____
2
___ him. Then, I can buy a
stamp ____
3
___ the post office. I put the stamp ___
4
____ the top. At last, I write the address ___
5
___
the right.
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问答题 简答题
开关机构泄压,一般指哪几种情况?
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