根据有关标准和入网要求，开关电源均分负载不平衡度不超出（）输出额定电流值
A．±4%
B．±4A
C．±5%
D．±5A
参考答案：C
The battle lasted for a few hours and at last the enemy ________.
A．was defeated
B．were beat
C．were won
D．defeated
按照现行国家标准，商品煤质量验收时，单项质量指标的差值等于（）减去（）。
