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單項(xiàng)選擇題

The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

A.specific gravity
B.viscosity
C.acid value
D.calorific value

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單項(xiàng)選擇題

The （） of the diesel oil must not exceed 120 degree Fahrenheit.

A.temperature
B.pressure
C.acid value
D.viscosity

單項(xiàng)選擇題

The （） is not properly set thus causing either advanced or retarded firing.

A.piston
B.fuel injection pump
C.crankshaft
D.oil can