单项选择题
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
A vessel may be unable to take proper and effective act...
单项选择题A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A.is B.is to be C.will be D.being
