做两个环,联著绳的一端,确定好绳的长度。应急时,两环套在两大腿根,戴手套的手抓住下滑,不能全靠手。
做两个环,联著绳的一端,确定好绳的长度。应急时,两环套在两大腿根,戴手套的手抓住下滑,不能全靠手。
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