单项选择题

——Your guests are waiting for you outside.——（）

A.The waiter said he'd bring me another.
B.Really? He said they were inside the desk.
C.Oh? I wasn't expecting them until three.

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多项选择题

A.机械危险源
B.电气危险源
C.振动危险源
D.人及其环境引起的危险源

单项选择题

A.I placed it on the edge of the desk.
B.No, I placed it over the phone.
C.All of those places look the same.