The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.

[单选题]The piston moving up and down keeps the crankshaft （）.A . to revolveB . revolvedC . revolvingD . to be revolved

[单选题]The piston moves up and down, thus causing the rotational movement of the（）A . crankshaftB . connecting rodC . cross-headD . main beating

[名词解释] 推送速度 pushing speed

[名词解释] 推送线 pushing track

[名词解释] 牵引小车 pushing carriage

[单选题](piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A．brake horsepowerB．displacementC．cylinder volumeD．cylinder clearance

[名词解释] 驼峰推送部分 pushing section of hump

[单选题]As to the piston cooling, of the following, which statement is not true?（）A . Because the piston is exposed to very high temperature, it must be cooledB . The lower the piston cooling temperature is, the better it isC . Both water and lube oil can be

[单选题]The piston rings are manufactured with a diameter （） the bore of the cylinder.A . larger thanB . smaller thanC . equal toD . none of the above

[单选题]The lowest ring of a piston is （）.A . a coil springB . a sealing ringC . an oil distributor ringD . main seal ring