單項選擇題

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

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單項選擇題

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

單項選擇題

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