单项选择题

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）.

A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relief valves

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单项选择题

How many PPM of the oily water can be pumped out within 12 miles along the China coast line?（）.

A.at least 15 PPM
B.about 15 PPM
C.up to 15 PPM
D.no less than 15 PPM

单项选择题

How is the Master or operator of a vessel required to keep the crew informed of the regulations concerning the discharging of garbage overboard?（）.

A.Give each crewmember a copy of ANNEX V of MARPOL
B.Call an all hands meeting before sailing
C.Keep placards prominently posted
D.Have each person read and sign a copy of the regulations

单项选择题

Biodegradation of the oil slick in sea water is assisted by all the following marine micro-organisms which are capable of metabolising oil compounds except（）.

A.bacteria
B.moulds
C.yeasts
D.seals