单项选择题
After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
A.frequent opening of hatches to permit entry of fresh air
B.regular checks of bilge levels
C.use of ear plugs to dampen engine noise
D.frequent flushing of the water spray system with fresh water
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相关考题
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单项选择题
A vessel fishing at night，with gear extending more than 150 meters horizontally outwards，will show in the direction of the gear（）.
A.one white light
B.two vertical white lights
C.one yellow light
D.two vertical yellow lights -
单项选择题
A shore is a piece of securing dunnage that（）.
A.runs from a low supporting level up to the cargo at an angle
B.is also known as a distance piece
C.is placed on the deck under the cargo to distribute its weight evenly
D.is run horizontally from a support to the cargo -
单项选择题
A ship is responsible for the cargo loaded or unloaded（）.
A.only when the cargo is within its rail
B.after the cargo is checked by tallymen
C.as soon as the cargo loading or unloading begins
D.during the time when loading or unloading is going on
