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单选题
The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.
A
sufficient quantity； measured
B
measured quantity；sufficient
C
excessive quantity；sufficient
D
the less quantity the better；the more the better
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单选题The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.A
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