问题
多项选择题
继电保护的操作交流电源与直流电源相比较（）
A、节省投资
B、减小运行维护量
C、可靠性高
D、投资大
答案
参考答案：A, B
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继电保护的操作交流电源与直流电源相比较（）
A、节省投资
B、减小运行维护量
C、可靠性高
D、投资大
参考答案：A, B
| 词形变换。选择方框里的词，并用其适当形式填空，每词只用一次。 | |
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