The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）

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  A . shims B . packing C . glands D . washer

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• The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

  A . steel guides B . steel shells C . steel bearing caps D . pig iro

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• For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

  A . a gravity tank B . a sump C . a vessel D . a bottle

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• The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.

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• Which of the following may take place if the clearance of the main bearings are excessive?（）

  A . bearing knocks B . dropping of pressure of LO C . noises D . all the above

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• The main bearing metal is a lining （）.

  A . inside the bearing B . outside the bearing C . covering the crankshaft D . none of the above

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