负有安全生产监督管理职责的部门对检查中发现的事故隐患，应当责令立即排除。
参考答案：对
______ he was at home, I would have phoned him then.
A．Had I known
B．I had known
C．Would I know
D．I would know
正铲挖土机作业特点中说法错误的是（）。
A.开挖停机面以上土方
B.工作面应在l.5m以上
C.开挖高度超过挖土机挖掘高度时，可采取分层开挖
D.可装车和两边甩土、堆放
