11选5中任选2有多少种组合方式

简介：As soon as the fish belly white appeared in the east, Zhu Cixiang woke up. He had not slept for even an hour. The war was about to begin. He was heavy and anxious, and could not fall asleep at all. He stood up in his clothes and sat under the lamp, looking at the topographic map of Zhongmou and a secret letter just sent by Liang Yizhang, thinking about the battle plan after dawn.