单项选择题
A.to reduce B.to increase C.and reduce D.and increase
Please draw out a 01 mm （） between the two halves of th...
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
Pistons of marine medium speed diesel engines may be ma...
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
Pistons may be made in （） in order to keep the weight d...
单项选择题Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.
A.cast iron B.forged steel C.stainless steel D.aluminum alloy
