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【多选题】
关于救生圈在船上的布置问题，下面的描述正确的是：()A.
应分布在船舶两舷易于拿到之处，并在可行范围内，分放在所有延伸到船舷的露天甲板上;
B.
至少有1 个应放在船尾附近;
C.
每只救生圈应具有不少于2.5kg的质量;
D.
为确保不至掉落或丢失，在航行时，其分别系固于船舶两舷处。
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A.
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B.
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C.
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