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【单选题】
负荷计算的目的是( )。
A.
电气负荷是供配电设计所依据的基础资料，通常电气负荷是随时变动的
B.
确定设计各阶段中选择和校验供配电系统及其各个元件所需的各项负荷数据
C.
计算负荷是一个假想的、在一定时间间隔中的持续负荷，它在该时间间隔中产生的特定效应与实际变动负荷的效应相等
D.
计算负荷通常按其用途分类(见3．1．2)。不同用途的计算负荷应选取不同的负荷效应及其持续时间，并采用不同的计算原则和方法，从而得出不同的计算结果
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