单项选择题

The light on a life jacket must be replaced（）.

A.when the power source is replaced
B.each year after installation
C.every six months
D.when it is no longer serviceable

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单项选择题
The lifesaving equipment on all vessels shall be（）.

A.inspected weekly
B.stowed in locked compartments
C.readily accessible
D.tested yearly
单项选择题
The life jackets on all vessels shall be（）.

A.inspected weekly
B.worn at all times
C.readily available
D.tested yearly
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