单项选择题
After an IOPP Certificate is issued to an inspected vessel，how many other surveys of the vessel’s pollution prevention equipment are conducted during the period of validity of the certificate?（）
A.None
B.One
C.Two
D.Three
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单项选择题
ACCIDENTAL ESCAPE OF OIL OUT OF A TANK WHEN IT GETS TOO FULL BECAUSE PUMPING WAS NOT STOPPED IN TIME defines（）.
A.Overloading
B.Over discharging
C.Overflow
D.Overtaking -
单项选择题
A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.
A.filling completely
B.developing free surface
C.developing free surface moment
D.collapsing -
单项选择题
A virtual rise in the center of gravity of a ship may be caused by（）.
A.filling a partially filled tank
B.using fuel from a pressed fuel tank
C.emptying a partially filled tank
D.transferring pipe from the setback area to the pipe rack
