堆石坝坝体材料分区中,( )的主要作用在于为面板提供平整、密实的基础,将面板承受的 发布时间:2018-07-01 06:34 │ 来源:www.tikuol.com 题型:单项选择题 问题: 堆石坝坝体材料分区中,( )的主要作用在于为面板提供平整、密实的基础,将面板承受的水压力均匀传递给主堆石体。A.过渡区B.下游堆石区C.垫层区D.次堆石区
题型:单项选择题 Mr Smith _____ his living by teaching ten years ago and he _____ greatly from his work.[ ]A. earned;earned B. earned;gainedC. gained;gained D. gained;earned 查看答案