The lowest ring of a piston is （）.

[单选题]The piston ring grooves for a standard engine are （）A . chromium-plate against wearB . anti-corrosion treatedC . white metal lined against wearD . flame hardened against wear

[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]A．ccording to the forecast the lowest recorded temperature was______.A． 51 degreesB． 65 degreesC． in the upper 60sD． in the mid to upper 70s

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

[单选题]Please quote us your lowest prices _____ CIf Singapore basis for embroidered silk blouses _____ prompt shipment.A . in, forB . from, forC . on, onD . from, on

[单选题]Which of the following measures is lowest for a currently callable bond?A.M

[单选题]英语PISTON指（）A .活塞B .开关C .按钮D .弹簧

[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

[名词解释] 神经环（nerve ring）