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
单项选择题 Each hose used for transferring vapors must（）.
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（）.
单项选择题 Each hand portable fire extinguisher on a ship must be marked with（）.
