属于水泥混凝土特点的足()。
A、抗拉强度高
B、能耗高
C、强度/重量比值低
D、韧性好
参考答案：C
The couple overjoyed ________ words on hearing their son survive the airplane crash by a miracle.
A．of
B．in
C．beyond
D．above
水泥路面裂缝的修补
