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【单选题】
低血容量性休克时，使用血管收缩剂的主要不良反应是A.
进一步减少组织器官灌注
B.
肾血流量减少，导致少尿
C.
强烈收缩血管(主要为小动脉)，增加心脏后负荷
D.
心率加快、心律失常
E.
升高血压以减少组织灌注为代价
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A.
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B.
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C.
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D.
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A.
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B.
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