如煤粉仓四角有积粉工作人员需靠近铲除时，应先放置跳板，跳板应

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问题填空题

如煤粉仓四角有积粉工作人员需靠近铲除时，应先放置跳板，跳板应有足够的强度和宽度，并须放置牢固。铲除积粉应使用（）或（）工具，防止产生火花。

答案

参考答案：铜质；铝制

问答题简答题

什么叫流度比？

补全对话，情景问答

情景交际。

A: Excuse me. 1 the post office?

B: Go down this street and turn right at the second crossing. Go up the road to the end, you'll find it.

A: 2 ?

B: It's about 500 meters away from here.

A: Oh, that's quite a long way.

B: Yes, __ 3 take a bus.

A: 4 ?

B: You can take the No.7 bus. It'll take you there.

A: 5 ?

B: It takes about fifteen minutes.

A: Thanks very much.

B: My pleasure.