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[单选题]
感受器的适应现象表现在持续刺激条件下
A
动作电位发放频率变慢
B
动作电位幅度变小
C
动作电位发放频率变慢，幅度变小
D
动作电位潜伏期延长
E
动作电位发放频率变快
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试题答案：
A
答案解释：
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