多项选择题

关于主从JK触发器的电路特点说法正确的是（）

A、触发器的状态改变在CP的下降沿。
B、CP下降沿到来时从触发器按照主触发器的状态翻转。
C、CP＝1期间主触发器接收输入端（J、K）的信号，被置成相应的状态，而从触发器不动。
D、使用主从JK触发器时，允许CP=1期间J、K改变。

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