单项选择题
A.Full Ahead B.Half Ahead C.Full Astern D.Half Astern
The trim of a vessel is the （）.A.value of the mean draf...
单项选择题The trim of a vessel is the （）.
A.value of the mean draft B.degree of list C.amount of roll D.difference in fore and aft drafts
The explosive range of a mixture of flammable vapors is...
单项选择题The explosive range of a mixture of flammable vapors is specified as a percentage of （）.
A.flammable vapor by volume in air B.oxygen present to support combustion C.the temperature of the flash point D.the lower limit of explosibility of the mixture
What safety precautions should be observed by the crew ...
单项选择题What safety precautions should be observed by the crew while working around machinery in an engine room?（）
A.They should wear safety shoes B.They should wear ear protection C.They should not wear jewelry D.All of the above
