A．) rings

B．) cycles

C．) circles

D．) rounds

[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]D．uring UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ____.A．Stop all F.O. transfers immediately, and inform the chief engineer.B．Make a sounding of the F.O. overflow tank and decide if the

[单选题]A．fterafewroundsoftalks,bothsidesregardedtheterritorydispute________.A．)beingsettledB)tobesettledC)hadsettledD)assettled

[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of _____A．nutsB．boltsC．coil springsD．stuffing boxes

[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of （）.A . nutsB . boltsC . coil springsD . stuffing boxe

[名词解释] 气相型循环（Gaseous Type Cycles）

[单选题]The piston rings if found worn out （） and supplied by shipchandler.A . must replaceB . must to be equippedC . has to be repairedD . have to be renewed

[单选题]The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.A . an oil sealB . removing heatC . a gas sealD . cooling the pisto

[单选题]Among the rings of a piston the （） one is subjected to the greatest load and temperature.A . bottomB . middleC . topD . none of the above

[单选题]All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.A . the running-in periodB . the running processC . gas exchange processD . the boiler firing