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單項(xiàng)選擇題

The main function of the lubrication system in to enable （） of a film of oil between the moving parts.

A.the information
B.the formation
C.the scatter
D.the friction

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單項(xiàng)選擇題

The main factor which determines the output of each cylinder is （）

A.the cylinder weight
B.the cylinder bore
C.the cylinder length
D.the cylinder cover

單項(xiàng)選擇題

The main factor determining the output of each cylinder is the cylinder （）.

A.density
B.bore
C.weight
D.material

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