单项选择题
The following preparations are essential for any （） of marine diesel engine before it may be started.
A.doing
B.make
C.turn
D.operating
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The diesel engine consumes considerably less fuel than the steam engine for equal output, （） enables a motor-ship to load more cargo.
A.why
B.which
C.in which
D.on which -
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It was （）midnight that we removed the trouble and went back to our cabin.
A.until
B.not until
C.not before
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Which of the statements listed concerning heat transfer is correct?（）
A.Heat is always transferred at a constant rate
B.Heat transfer rate increases as temperature difference increases
C.The rate of heat transfer is not affected by temperature difference
D.The high temperature region is known as a heat sink
