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问题 判断题

梯形木支架的棚腿的倾角为90°。

答案

参考答案：错

选择题
— Which restaurant should we choose?
— __________ It's all the same to me.

A. It's up to you.
B. That's settled.
C. It all depends.
D. Have you got that?
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选择题

近年，我国部分地区采煤的矿井“瓦斯爆炸”事件不断发生．与瓦斯（主要成分为甲烷）爆炸不相关的因素有（　　）

A．矿井里含有氧气和甲烷

B．甲烷的含量达到爆炸极限

C．矿井空间有限

D．温度未达到甲烷的着火点
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