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單項選擇題

While engine is in operation the piston moves up and down, thus causing the rotation of the （）.

A.crankcase
B.slipper
C.cam housing
D.crankshaft

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單項選擇題

Which of the following would cause a diesel to have black smoke?（）

A.leaky injector
B.water in the gas
C.too heavy oil
D.water in the oil

單項選擇題

Which of the following will 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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