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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
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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