膨胀土路堑基床换填要紧随开挖完成,当有困难时,应暂留厚度不小于()m的保护层。路堑基床表层应按设计设置封闭层。
A、0.25
B、0.5
C、0.6
参考答案:B
Ann is a kind girl. She her seat to an old man on the crowded bus this morning. [ ]
A. took
B. lent
C. offered
D. brought
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