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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相关考题
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单项选择题
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（）.
A.directly under the boom
B.moving away from the boom
C.stopped dead in the water
D.tied to the boom -
单项选择题
After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.
A.hoist man
B.limit switch
C.brake handle
D.preventer bar
