单项选择题
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
A.the master and the chief engineer are unable to communicate effectively
B.serious corrosion on the hull
C.damaged sanitary pump
D.one page missing in the oil record book
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The shipboard oil pollution emergency plan will be invalid after （）
A.one year
B.two years
C.four years
D.five years -
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（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
A.Ring type
B.Fork type
C.Spade type
D.Push on pull off type -
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A.anaerobic bacteria
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C.air bubbles
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