使用气圈时，应充气（）满度，套上布套，布套应平整无折，气门向下放于两腿之间，以免压迫局部组织。

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【单选题】【消耗次数：1】

① 2/3~3/5

② 1/3~1/2

③ 2/3~3/4

④ 1/2~2/3

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