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皮皮学刷刷变学霸
举一反三
【单选题】He cleaned the old machine and_________ the moving parts with a little mineral oil, hoping that it could work again
A.
hacked
B.
lubricated
C.
lubricating
D.
stoped
【单选题】T he blower type crankcase ventilation system ____
A.
remove combustible gases from the crankcase
B.
prevents the formation of combustible gases in the crankcase
C.
cools lubricating oil
D.
improves cold weather starting
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