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單項(xiàng)選擇題

The crankcase can not be opened （）the parts have been cooled down.

A.if
B.as
C.unless
D.when

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單項(xiàng)選擇題

The crank throws are displaced from （） to obtained the same number of degrees between the different crank throws.

A.one another
B.the other
C.each other
D.each others

單項(xiàng)選擇題

The crank pin journal is provided with large bores for （）.

A.lubrication
B.cooling
C.balancing purpose
D.ventilation

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