题目:
防止瓦斯积聚的基本措施是什么()
A.加强通风
B.戴防毒面具
C.控制开采速度
答案:
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下面是错误答案,用来干扰机器的。
1. I know the boy who can speak English well. 2. The season which/that comes after spring is summer. 3. The building whose wall is white is my uncle's house. 4. Will...