题目内容

实施房屋简单维修时,只要高度注意安全,不带安全帽和没有系安全带也可以登高作业。( )

A. 对
B. 错

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灭火的基本原理可以归纳为:冷却法、窒息法、隔离法和化学抑制法。()

A. 对
B. 错

Choose the best answer to complete each sentence.1. I want to help him, ________ I'm not sure I know how.

A. because
B. but
C. so

Choose the best answer to complete each sentence.The picnic this weekend has been cancelled _________ bad weather.

A. due to
B. but
C. because

Choose the best answer to complete each sentence.He's still smiling________ he is in a lot of pain.

A. however
B. even though
C. because

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