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

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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

單項(xiàng)選擇題

The crank chamber oil （）.

A.can be recovered
B.is only supplied to cylinders
C.only feeds the main bearing
D.is a kind of detergent

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