单项选择题
Waste oil from the lube oil sumps of machinery may NOT be （）.
A.drained into the vessels bilges
B.reclaimed for other uses
C.held in a slop tank
D.purified and then reused
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Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.
A.when the remaining charge volume is less than 90 percent of the required VOLUME
B.at each inspection for certification
C.at each annual inspection
D.when the weight loss exceeds 10% of weight of charge -
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The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.
A.welding brackets across both ends of the crack
B.chipping out and slot welding the entire crack
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D.cutting a square notch at each end of the crack -
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The fire extinguishing action of CO2 comes mostly from （）.
A.breaking the fire chemical chain reaction
B.smothering
C.cooling
D.isolating the heat from the fuel
