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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A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds
A.a filter
B.a strainer
C.a magnetic filter
D.a fine strainer
A.tank
B.sump
C.vessel
D.bottle
A.a coil spring
B.a sealing ring
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A.the crosshead
B.the journals of the crosshead
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D.the guides
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