常见的混凝土坝的滑动破坏型式可分为（）。
A.表层滑动
B.倾倒
C.浅层滑动
D.深层滑动
E.失稳
参考答案：A, C, D
在△ABC中，AB=AC，BC=10cm，△ABC的面积为60cm2，那么AB=______cm．
——Can I pay the bill by check?
——Sorry, sir. But it is the management rule of our hotel that payment ____ be made in cash.
A．shall
B．need
C．will
D．can
