单项选择题
A.acids or alkalies B.diesel oil C.acids，but not alkalies D.alkalies，but not acids
Changing rescuers while carrying out artificial respira...
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
Before personnel are lifted from a vessel in a personne...
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
After the boat is at the top of the davit heads，the dav...
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
