单项选择题

A.(三相中实测最大值-最小值)*100%/三相中实测最大值
B.(三相中实测最大值-最小值)*100%/三相中实测最小值
C.(三相中实测最大值-最小值)*100%/三项算术平均值
D.(三相中实测最大值-最小值)*100%/三项加权平均值