A.when
B.how
C.where
D.whether
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A.slow-speed diesel
B.medium-speed diesel
C.high-speed diesel
D.constant-speed diesel
A.injector
B.compressor
C.diffuser
D.siphon
A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking
A.keyway
B.shaft
C.packing
D.valve
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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