A rigid lifesaving device only designed for survivors to hold on to while in the water is a（）.<br>A:liferaft<br>B:life float<br>C:life preserver<br>D:buoyant apparatus

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

出自：海船船员证

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