采煤机超挖或欠挖，造成底板不平，要（），确保大溜平直度。
A.及时通知机组司机返刀
B.停机吊溜
C.正常割煤
D.正常顶溜
参考答案：A, B
Can you tell me the way to the post office?
A．The person is over there.
B．Sorry, I’m not from around here.
C．I don’t know you.
D．I know your name.
滥用抗生素容易导致什么后果？
