单项选择题

Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every（）.

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

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By regulation，cargo tanks must be inert before and during what operation?（）.

A.Stripping
B.Loading
C.Cleaning
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单项选择题

By regulation，cargo tank atmosphere must be inert before and during which operation?（）

A.Stripping
B.Loading
C.Cleaning
D.All of the above

单项选择题

An oil tanker，except as provided for otherwise，might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.

A.she is not within a special area
B.she is within a special area
C.she has just departured from a special area
D.she is about to enter a special area