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当前学科:1B420050公路工程质量检查与检验
题目:
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通信电源的实测项目中属于关键项目的是()。
A . 开关电源的主输出电压
B . 电池组供电特性
C . 通信电源系统防雷
D . 设备安装的水平度
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