Piston No2 of main engine has been removed, and it will be （） by noon tomorrow.

[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]While engine is in operation the piston moves up and down, thus causing the rotation of the （）.A . crankcaseB . slipperC . cam housingD . crankshaft

[单选题]For a diesel engine, when the piston is at the （）, the clearance volume is the largest.A . TDCB . DTCC . BDCD . DBC

There has been a collision （） a number of cars on the main road to town.A. compo

[单选题]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.A . oil sprayB . oil bathC . oil control ringsD . drilled passage through the camshaft

[单选题]A diesel engine piston ring face is in direct contact with the （）.A . top of the ring grooveB . cylinder liner oil filmC . bottom of the ring grooveD . back of the ring groove

[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 the （）.A . crossheadB . crankpinC . crank journalD . gudge

[单选题]This used piston had been tested and approved as a spare part by the （） during last annual repair.A . agentB . shipchandlerC . surveyorD . engineer

[单选题]The main purpose of the piston oil scraper rings is to （）.A . seal the space between the piston and the linerB . reduce the amount of lube oil burned in the combustion chamberC . transmit heat from the piston to the cylinder linerD . damp out fluctua

[单选题]An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.A . viscosityB . twisting momentsC . inertiaD . thermal expansio