能量单位，尤指电能，等于一瓦特一小时所做的功，相当于3，'00焦耳。
A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour and equivalent to 3, '00 joules.
能量单位，尤指电能，等于一瓦特一小时所做的功，相当于3，'00焦耳。
A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour and equivalent to 3, '00 joules.
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