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问题 单项选择题

如煤样水分过大或天气阴雨，在制样时允许采用低温干燥煤样，以缩短制样时间，规定的干燥温度为（）

A.不超过80℃

B.不超过100℃

C.不超过50℃

D.不超过40℃

答案

参考答案：C

句型转换

完成下列同义句转换。

1. They don't do anything every day.

    They have ____ ____ _____ every day.

2. Tom always works hard at English.

    Tom work hard at English ____ ____ ____.

3. Who will look after your baby?

    Who will ____ ____ ____ your baby?

4. How many windows are there in the room?

    How many windows _____ the room ____?

5. Our home isn't near the school.

    Our home is _____ ____ the school.
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多项选择题

扑灭瓦斯燃烧引起的火灾时，可采用（）等手段积极灭火。

A.可采用震动性手段灭火

B.可采用干粉、惰气等灭火

C.有浮煤参与燃烧时可采用泡沫灭火

D.不能采用二氧化碳灭火器灭火
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