管道基础采用天然地基时,地基因排水不良被扰动时,应将扰动部分全部清除,可回填()。
A.卵石
B.级配碎石
C.碎石
D.低强度混凝土
E.中粗砂
参考答案:A, B, C
You ______ be hungry already — you had lunch only two hours ago![ ]
A. wouldn't
B. can't
C. mustn't
D. needn't
无缓和曲线时,超高顺坡可在圆曲线和直线上进行。