单项选择题
Pumps and fine filters are arranged （） with one as standby.
A.in duplicate
B.in double
C.at twice
D.for two
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相关考题
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单项选择题
Please draw out a 0l mm shim between the two halves of the bearing （） the clearance.
A.to reduce
B.to increase
C.and reduce
D.and increase -
单项选择题
Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.
A.shim
B.gasket
C.washer
D.packing -
单项选择题
Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.
A.lead
B.forged steel
C.alloy steel
D.aluminum alloy
