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【单选题】
关于哌替啶作用特点的描述，正确的是A.
镇痛镇静作用较吗啡弱
B.
可引起便秘，并有止泻作用
C.
对妊娠末期子宫有抗催产素作用
D.
不扩张血管，不引起体位性低血压
E.
提高胆道压力作用较吗啡强
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