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【单选题】
护士自安瓿内抽吸维生素C注射液,以下吸取药液的方法哪错误的( )。
A.
将针头斜面向下放入安瓿内液面下吸药
B.
将安瓿尖端药液弹至体部
C.
仔细检查
D.
吸药时不能用手握住活塞体
E.
用砂轮在安瓿的尖端部划一锯痕，折断安瓿
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【单选题】蛋白质的平均含氮量是
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