单项选择题

It was （）midnight that we removed the trouble and went back to our cabin.

A.until
B.not until
C.not before
D.not after

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单项选择题

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

单项选择题

Which of the following operations must be entered on the Oil Record Book Part Ⅰ? （）
Ⅰ.Routine discharge at sea of bilge water containing oil from the machinery spaces
Ⅱ.Bunkering of fuel oil

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ

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The （）is used to measure power.

A.ammeter
B.voltmeter
C.wattmeter
D.frequency meter