在家庭电路中,用甲、乙两根电热丝先后给完全相同的三壶水加热至

在家庭电路中,用甲、乙两根电热丝先后给完全相同的三壶水加热至沸腾。单独接甲需用时间t1;甲、乙串联需用时间t2;则甲、乙并联需用时间t3______

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