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关于输出继电器下面叙述正确的有( )

多选题
2022-04-02 18:22
A、它只能由外部信号来驱动
B、它只能在程序内部由指令来驱动;
C、根据负载类型和用户要求,输出继电器有三种类型输出方式
D、无论采用何种输出方式,它只起到接通或断开负载回路的作用
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正确答案
BCD

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