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[单选题]
10kV及以下的供电电压允许偏差应为标称系统电压的();220V单相供电电压允许偏差应为标称系统电压的()
A.±7%;±7%
B.±7%;±10%
C.±7%;+7%~-10%
D.±7%;+7%
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A.±7%;±7%
B.±7%;±10%
C.±7%;+7%~-10%
D.±7%;+7%
A.+5%~-10%
B.+10%~-10%
C.+7%~-10%
D.+8%~-10%
A.35KV及其以上高压供电的,电压正、负偏差的绝对值之和不超过额定值的10%
B.10KV及其以下三相供电的,为额定值的±7%
C.220V单相供电的,为额定值的+7%~-10%
D.自动闭塞信号变压器二次端子,为额定值的±7%