单项选择题

Chemical burns are caused by the skin coming in contact with（）.

A.acids or alkalies
B.diesel oil
C.acids，but not alkalies
D.alkalies，but not acids

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Changing rescuers while carrying out artificial respiration should be done（）.

A.without losing the rhythm of respiration
B.only with the help of two other people
C.by not stopping the respiration for more than 5 minutes
D.at ten-minute intervals

单项选择题

Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.

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B.moving away from the boom
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