單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)選擇題Piston No2 of main engine has been removed, and it will be () by noon tomorrow.

A.lifted
B.reassembled
C.dismounted
D.disassembled

3.單項(xiàng)選擇題Persistent knocking in one cylinder of a diesel engine could be caused by().

A.a low load on that cylinder
B.sluggish piston ring action
C.excessive piston crown cooling
D.excessive clearance of piston pin

4.單項(xiàng)選擇題Operating conditions in the crank chamber are very () those in the cylinder.

A.the same as
B.similar to
C.separated from
D.different from

5.單項(xiàng)選擇題Opening of the cylinder () will admit compressed air into the cylinder.

A.safety valve
B.indicator cock
C.blow-down valve
D.start valve