单项选择题
A chock（）.
A.is a deck fitting used to shackle gear to the deck
B.permits easy jettisioning of deck cargo in an emergency
C.prevents stress concentration in the bulwark
D.provides opening through the bulwark for mooring lines
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相关考题
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A chock is a（）.
A.deck fitting used to secured mooring lines
B.casting fitting at the side of a weatherdeck, used as a fairlead
C.sharp block of wood used to support hygroscopic cargo
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单项选择题
A C02 portable extinguisher is annually checked by（）.
A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO2
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A contra-guide is a type of（）.
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D.rudder
