單項(xiàng)選擇題

Grind the （）.

A.keyway
B.shaft
C.packing
D.valve

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單項(xiàng)選擇題

Which of the following can be obtained by means of an indicator card?（）

A.the peak pressure in a cylinder
B.the temperature of the cooling water
C.the fuel consumption
D.none of the above

單項(xiàng)選擇題

The lower section of a piston is called the （）.

A.land
B.skirt
C.crown
D.plate

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