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【单选题】
护士巡视病房时，发现溶液不滴，挤压输液管感觉有阻力，松开无回血，应考虑（ ）
A.
针头滑出血管外
B.
静脉痉挛
C.
输液压力过低
D.
针尖斜面紧贴血管壁
E.
针头阻塞
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B.
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C.
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D.
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E.
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F.
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C.
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