多选:要使ACE正确反映本区域的有功不平衡量,必须满足()和()。

题目内容:
要使ACE正确反映本区域的有功不平衡量,必须满足()和()。
A.ACE保持在零附近
B.控制区应对外构成封闭区域
C.K值应等于区域的自然频率特性系数
D.K值应接近自然频率特性系数
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