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[单选题]
间歇阻断肝门血流。每次阻断时间不超过多少分钟,必要时可分次阻断()
A.5min
B.7min
C.1Omin
D.15min
E.20min
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A.5min
B.7min
C.1Omin
D.15min
E.20min
第4题
A.对α.β受体阻断活性相等
B.对α受体阻断强.对β受体阻断弱
C.对α受体阻断弱.对β受体阻断强
D.阻断β2受体.无内在拟交感活性
E.可降低心输出量.不引起直立性低血压
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