A.because
B.since
C.due to
D.owing to
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A.when
B.how
C.where
D.whether
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
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