單項(xiàng)選擇題

The （） chamber is enclosed between the cylinder head and piston.

A.lubrication
B.injection
C.cooling
D.combustion

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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

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