题目内容：
采煤机在工作面安装调试结束后，必须进行（）min空运转，无问题再沿工作面长壁循环采煤。A．10-20
B．20-30
C．40
D．50
参考答案：
单选：采煤机在工作面安装调试结束后，必须进行（）min空运转，无问题再沿工作面长壁循环采煤。A．10-20B．20-30C．40D．50
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- 题目类型：单选
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A．10-20
B．20-30
C．40
D．50
A．10-20
B．20-30
C．40
D．50
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