A.open
B.close
C.drain
D.vent
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A.discovered
B.had discovered
C.invented
D.had invented
A.because
B.thanks to
C.dues to
D.owing to
A.because
B.since
C.due to
D.owing to
A.when
B.how
C.where
D.whether
A.slow-speed diesel
B.medium-speed diesel
C.high-speed diesel
D.constant-speed diesel
最新試題
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