单项选择题

A rigid lifesaving device only designed for survivors to hold on to while in the water is a（）.

A.liferaft
B.life float
C.life preserver
D.buoyant apparatus

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单项选择题

A rigid lifesaving device designed to support survivors in the water is a（）.

A.rigid liferaft
B.life float
C.inflatable liferaft
D.survival capsule

单项选择题

A liferaft which has inflated bottom-up on the water（）.

A.should be righted by standing on the carbon dioxide cylinder，holding the righting straps，and leaning backwards
B.should be righted by standing on the life line，holding the righting straps，and leaning backwards
C.will right itself when the canopy tubes inflate
D.must be cleared of the buoyant equipment before it will right itself

单项选择题

A life line must be connected to the liferaft（）.

A.at the bow
B.at the stern
C.in the middle
D.all around