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單項選擇題

The crankcase cover should never be allowed to open for investigation when （）

A.the engine stops
B.the engine is running
C.you repair the engine
D.overhauling the engine

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單項選擇題

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

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

單項選擇題

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

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