问题 更新时间2023/4/3 12:59:00 ( ) A、 He compared his own map with other maps. B、 He talked with many U.S. captains. C、 He used drifting bottles to check his map. D、 Both B and C. 答案 登录 注册 D、 Both B and C. 出自:和学 >> 华北水利水电大学混凝土结构设计原理