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椎管内麻醉时血压下降主要是由于()

单选题
2021-12-25 14:09
A、交感神经部分受抑制
B、迷走神经部分受抑制
C、胸腔负压减少
D、交感神经部分兴奋
E、迷走神经部分兴奋
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正确答案
A

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