皮皮学，免费搜题
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【单选题】
吗啡不宜用于治疗慢性钝痛的主要原因（）
A.
对钝痛的作用弱痛
B.
引起呼吸抑制
C.
致便秘
D.
瘾
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【简答题】A．People work fewer days per week. B．People work more hours each day. C．The weekend has decreased in length. D．The number of national holidays has increased.
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