A．brake horsepower
B．displacement
C．cylinder volume
D．cylinder clearance
[单选题]During the suction stroke, the piston is moving （）.A . inwardsB . outwardsC . downwardsD . upward
Fuel injection begins during the compression stroke, before the piston reaches _
A piston in a four-stroke/cycle diesel engine makes four strokes during each( )
During the 4th stroke, ______ and piston moves up, pushing the burned gases out
[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
[单选题]英语PISTON指（）A .活塞B .开关C .按钮D .弹簧
[单选题]In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to theA．crossheadB．crankpinC．crank journalD．gudgeon pin
[单选题]If clearance between a piston and the cylinder wall is excessive, piston slap will occur. The slap itself is caused by_____.A．alternation of side thrustB．a breakdown of the lube oil film on the cylinderC．worn piston boss piston pin bearingsD．fluctuat