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问题
填空题
常用法兰的螺孔数均为（）的倍数。
答案
参考答案：
4
选择题
The coal miners ____ in the coal mine for 10 hours before we came to their rescue.
A. had trapped
B. had been trapping
C. had been trapped
D. would have been trapped
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单项选择题
法律规定代公司为意思表示的自然人是（）
A.经理
B.职员
C.董事长
D.董事会
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