问题
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
答案
参考答案：D
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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
参考答案：D