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【单选题】
关于电动吸引器吸痰的操作方法,错误的是A.
成人吸痰负压为40.0-53.3kPa
B.
插管时，护士应反折吸痰管末端
C.
先吸气管内分泌物，再吸口腔内分泌物
D.
导管退出后，应用生理盐水抽吸冲洗
E.
吸痰前，先用生理盐水试吸
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