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單項(xiàng)選擇題

Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.

A.TBN number
B.viscosity
C.temperature
D.foaming

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單項(xiàng)選擇題

The lower section of a piston is called the （）.

A.land
B.skirt
C.crown
D.plate

單項(xiàng)選擇題

The diesel engine valve subjected to most severe conditions of service is the （）.

A.cylinder exhaust valve
B.air starting valve
C.air inlet valve
D.cylinder relief valve