已知事件 A,B,CA,B,CA,B,C 的概率均不为 0,则 P(A)=P(B)P\left( A\right) = P\left( B\right)P(A)=P(B) 的充要条件是( )A. P(A∪B)=P(A)+P(B)P\left( {A \cup B}\right) = P\left( A\right) + P\left( B\right)P(A∪B)=P(A)+P(B)B. P(A∪C)=P(B∪C)P\left( {A \cup C}\right) = P\left( {B \cup C}\right)P(A∪C)=P(B∪C)C. P(ABˉ)=P(AˉB)P\left( {A\bar{B}}\right) = P\left( {\bar{A}B}\right)P(ABˉ)=P(AˉB)D. P(AC)=P(BC)P\left( {AC}\right) = P\left( {BC}\right)P(AC)=P(BC)