灌注水下混凝土如导管漏水有可能发生（）事故。
A.导管断裂
B.堵管
C.灌注速度太快
D.埋管
参考答案：B
--- You won’t believe it. Sam. I have been chosen as an exchange student to China .
--- Congratulations ! ___
A．That’s something.
B．You did a good job .
C．That’s all right.
D．You got it .
已知甲、乙、丙三家单位资质等级分别为水利水电施工总承包一级、水利水电施工总承包二级、水利水电施工总承包三级，若甲、乙、丙三家单位组成联合体参加投标，则该联合体的资质等级为( )。
A．水利水电施工总承包一级
B．水利水电施工总承包二级
C．水利水电施工总承包三级
D．水利水电施工总承包四级
