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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1.單項選擇題Grind the （）.
A.keyway
B.shaft
C.packing
D.valve
2.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
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