题目18. 若CF(H, E)=0.8且CF(E)=0.9,则CF(H)=?A. 0.72B. 0.8C. 1.7D. 0.918. 若CF(H, E)=0.8且CF(E)=0.9,则CF(H)=?A. 0.72B. 0.8C. 1.7D. 0.9题目解答答案A. 0.72