题目：
现时澳门电力系统提供的三相线电压是多少（）
A.380V/60Hz
B.400V/50Hz
C.380V/50Hz
D.400V/60Hz
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
现时澳门电力系统提供的三相线电压是多少（） A.380V/60Hz B.400V/5
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题型：单项选择题
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