单项选择题
Bilges may be pumped （）.
A.on the outgoing tide B.overboard after dark C.overboard through an oily water separator D.anytime in an emergency, i-emain engine lube oil failure
单项选择题 Waste oil from the lube oil sumps of machinery may NOT be （）.
单项选择题 Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.
单项选择题 The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.
