搜题请搜索小程序“爱下问搜题”
问题
单项选择题
（）工作面每班至少检查3次瓦斯浓度。
A、低瓦斯矿井
B、煤与瓦斯突出矿井
C、高瓦斯矿井
答案
参考答案：C
选择题
We were listening closely to the lecture yesterday evening when suddenly the light _____.
A. had been gone out
B. go out
C. was gone out
D. went out
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多项选择题
瘿病阴虚证有哪几项主症
A．心悸不宁
B．心烦少寐
C．手指颤动
D．两目汗涩
E．头晕目眩
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