Under MARPOL Code the ship to which it applies has to carry （）

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

单项选择题The shipboard oil pollution emergency plan will be invalid after （）

A.one year
B.two years
C.four years
D.five years

单项选择题（）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

单项选择题（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals

单项选择题For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

A.the temperature and flow quantity of the exhaust gas from M.E
B.the quantity of steam demanded
C.the rotary speed and the cooling water temperature of main engine
D.efficiency of M.E turbocharger