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题目类型：[多选]
[多选] 兴奋通过突触传递特征的叙述，错误的是（ ）
A
突触传递只能从突触前神经末梢传向突触后神经元
B
突触传递需要的时间与冲动传导差不多
C
在中枢神经系统内，只有兴奋可以发生总和，而抑制不会产生总和
D
在反射活动中，传入神经上的冲动频率往往与传出神经发出的冲动频率一致
E
突触传递过程中，极易受内环境变化的影响
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