单向板仅短边受力,板的厚度一般为跨度的1/40~1/35,且不小于( )。
A.100 mm
B.90 mm
C.120 mm
D.80 mm
参考答案:D
My father to read a book.[ ]
A. like
B. likes
C. liking
D. to like
一个动车两个转向架共有几个制动液压夹钳:()
A.4
B.8
C.16