斜裂缝主要发生在( )地基上。
A.软土
B.砂石
C.混凝土
D.石膏砂浆
参考答案:A
汽车的速度是72km/h,过凸桥最高点时,对桥的压力是车重的一半,则桥面的半径为__________m,当车速为__________m/s时,车对桥面最高点的压力恰好为零.(g取10m/s2)
Drink water and have ____ good rest, then you will feel better. [ ]
A. some; some
B. some; an
C. more; a
D. any; a