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单选题
这是用来产生、调节、控制和指示交流电的系统的一部分。
A
This is the portion of the systems used to generate, regulate, control, and indicate AC electrical power.
B
Here is that portion of the systems used to generate, regulate, control, and indicate AC electronic power.
C
That is the portion of the systems used to generate, increase, control, and indicate AC electrical power.
答案解析
正确答案：A
相关知识点：
此为交流电相关系统部分
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