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【单选题】
破坏蛙的脊髓,用1%硫酸滤纸片刺激蛙腹部皮肤,搔扒反射消失,其原因是
A.
感受器受损
B.
中枢受损
C.
效应器受损
D.
传入神经受损
E.
传出神经受损
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A.
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A.
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B.
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A.
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B.
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D.
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