代表出口中间继电器的文字符号是（）
A、KM；
B、KCM；
C、KOM；
参考答案：C
解析：
知识点：二次回路
— Did you hear the news this morning?
— Oh, yes, _____ was announced on the radio has caused great excitement among the students. [ ]
A. that
B. what
C. as
D. it
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