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【单选题】
公共题干:患者男,67岁。患慢性支气管炎。近几天咳嗽加剧,痰液黏稠,不易咳出,给予超声波雾化吸入治疗。进行雾化吸入时不正确的操作步骤是
A.
水槽内蒸馏水
B.
雾化罐内药液稀释至30～50ml
C.
先开电源开关，再开雾化开关
D.
使用中水槽内换不必关机
E.
治疗毕，先关雾化开关，再关电源开关
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@-25,-10
D.
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