單項(xiàng)選擇題You are unable to pump out the aft starboard engine room bilge well that is fouled, with one foot of water over the top of the bilge well, what action should be carried out?()

A.Send the wiper into the well with only a scoop and pail
B.Remove the bilge manifold valve and attempt to back flush the line
C.Simultaneously operate all available bilge pumps
D.It is only necessary to transfer half the contents of a drum of degreaser into the bilge well


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1.單項(xiàng)選擇題Wear occurring at the tips of the reduction gear teeth is usually the result of ().

A.surface fatigue
B.fretting corrosion
C.heavy overloading
D.gear misalignment

4.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

5.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