单项选择题
A.metacentric height is positive B.metacentric radius is positive C.KG exceed maximum allowable limits D.Free surfaces are excessive
Emergency escape breathing device on board shall have a...
单项选择题Emergency escape breathing device on board shall have a duration of service no less than（）.
A.20 minutes B.15 minutes C.10 minutes D.5 minutes
All engines in lifeboats and rescue boats shall be run ...
单项选择题All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.
A.2 minutes B.3 minutes C.4 minutes D.5 Minutes
The master shall ensure that any seafarers（）are provide...
单项选择题The master shall ensure that any seafarers（）are provided with an adequate period of rest.
A.who have performed work for 14 hours B.who have performed work in a scheduled rest period C.who have performed work in a scheduled work period D.who works hard
