天然地基的特点是()。
A.施工简单
B.监理难度小
C.进度易于控制
D.造价低
E.用时短
参考答案:A, D
David was ____ in the second half of the football match after a serious knee injury.
A.scheduled
B.abandoned
C.reserved
D.substituted
共析钢奥氏体过冷到350℃等温得到()。
A.马氏体
B.珠光体
C.屈氏体
D.贝氏体