采用钢筋混凝土梁比无钢筋的水泥梁的强度更强，这里主要是指前者比后者（）。
A、抗弯
B、抗压
C、抗拉
D、抗剪
参考答案：C
29．Do you expect_____ a possibility_____ we shall be able to afford the particular furniture we need?
A．it being; that
B．that being; which
C．one to be; what
D．there to be; that
什么叫二次系统图？
