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【单选题】
M 受体兴奋引起的效应是A.
支气管扩张
B.
腺体分泌减少
C.
胃肠平滑肌收缩
D.
骨骼肌收缩
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A.
is used both as a cultural and a physical object
B.
serves different purposes equally well
C.
is utilized by man
D.
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A.
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