单项选择题30 Assume that F is a forest, made up of tree T1, T2, T3, and the node numbers of T1, T2, T3 are n1, n2, n3 respectively. If the binary tree corresponding to F is B, there are ( ) nodes in the left subtree of B.
多项选择题客服人员在咨询接待过程中,利用一定技巧可以( ) A、A. 解决客户的疑问 B、B. 让客户了解产品、企业信息 C、C. 得到客人的认可 D、D. 顺利完成销售