题目: 泥浆润滑套下沉沉井的方法,是在沉井外壁周围与土层间设置膨润土泥浆隔离层,减少土壤与井壁的摩阻力,以利沉井下沉,一般泥浆润滑套与井壁的摩阻力为( )t/m2。A.0.4~0.5B.0.3~0.6C.0.4~0.6D.0.3~0.5 答案: 参考答案:D
题型:选择题 You'd better _______ at home. It's cold outside. [ ]A. stay B. to stay C. stays D. staying 查看答案