下列管材中,()可以在液压系统传动用作油管。
A.无缝钢管
B.有缝钢管
C.铸铁管
D.硅铁管
参考答案:A
The crowd cheered wildly at the sight of LiuXiang, who was reported __ the world record in the 110- meter hurdle race.
A.breaking
B.having broken
C.to have broken
D.break
《都江堰》是一篇()。
A.写景散文
B.写人散文
C.游记
D.抒情散文