埋设在人行道下的0.4管道,其埋深可以为()
A.0.3
B.0.4
C.0.5
D.0.6
参考答案:D
What impresses me most is ____ heappears in front of others, he wears a smcere and charming smile. [ ]
A. what
B. which
C. that where
D. that whenever
后张法预应力钢筋张拉后,需进行孔道灌浆,其目的是( )。
A.释放多余应力B.保护预应力钢筋C.弥补应力损失D.防止混凝土弹性压缩