题目内容

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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隧道排水应避免采用()排水。

简述母公司和控股公司的异同。

隧道洞口边、仰坡冲沟宜采用()等工程措施。

本利比是每股市价与每股税后净利的比率。

A. 正确
B. 错误

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