单项选择题
Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.
A.at work，only
B.in his or her berthing area，only
C.BOTH at work and in his or her berthing area
D.None of the above
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单项选择题
Each hose used for transferring vapors must（）.
A.have a design burst pressure of at least 25 psig
B.be capable of withstanding at least 2.0 psi vacuum without collapsing or constricting
C.be electrically continuous with a maximum resistance of ten thousand ohms
D.All of the above -
单项选择题
Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
A.six weeks
B.six months
C.twelve months
D.two years -
单项选择题
Each hand portable fire extinguisher on a ship must be marked with（）.
A.the name of the unit on which it is located
B.the date that it was installed on the unit
C.the names of the individuals qualified to use it
D.an identification number different from other extinguishers on the unit
