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單項選擇題

（）, the engine must be stopped immediately.

A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking

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單項選擇題

Grind the （）.

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

單項選擇題

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