單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The ()is used to measure power.

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

4.單項(xiàng)選擇題If you burned your arm on a bare steam line, the most effective immediate treatment would be to()

A.wrap the arm in a tight bandage
B.soak the arm in hot salt water
C.cover the burn with petroleum jelly
D.put the burn in cold water