以下四组220V单相供电系统电压偏差值( )在允许偏差范围内.A. +5%, -8% B.-10%, -7%; C.+8%, -5%; D. +10%,-6%.

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问题 以下四组220V单相供电系统电压偏差值( )在允许偏差范围内.

选项 A. +5%, -8%
B.-10%, -7%;
C.+8%, -5%;
D. +10%,-6%.

答案AC

解析
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