单项选择题

Generally，what is used to inflate liferafts?（）.

A.non-toxic gas
B.Oxygen
C.Hydrogen
D.Helium

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单项选择题

Each liferaft，which does not have an indicated maximum stowage height indicated on the liferaft，must be（）.

A.limited to carry no more than 10 persons
B.stowed not more than 59 feet above the lightest waterline
C.stowed in quick release racks
D.inspected every six months

单项选择题

Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.

A.the call sign and name
B.the official number and name
C.the port of registry and name
D.the port of registry and official number