The piston rings if found worn out （） and supplied by shipchandler.

[单选题]These piston rings are so badly worn that they must be （）.A . renewedB . weldedC . machinedD . chromium-plated

[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]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]The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A．fed from mechanical lubricatorsB．thrown off from the main bearingsC．supplied from wick fed drip lubricatorsD．flow from a centrif

[单选题]Worn out ring grooves should be （） to standard dimension after being welded.A . machinedB . boredC . honedD . drilled

[主观题]I had worn out two pairs of boots on the walking tour , I needed a third one (疑问：此处的a third 能不能换成the third ）谢谢

[单选题]The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.A . sea waterB . scavenging airC . lubricating oilD . fuel oil

[问答题]Bob and Peter found out that they were twin brothers.

[单选题]John suggested _________ anything about it until they found out more facts.

[单选题]根据下面资料，回答题 I was out for my usual morning run and found myself stumbling th