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?（）<br>A:None<br>B:One<br>C:Two<br>D:Three

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

出自：海船船员证

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