软件测试的目标是（）。
A.证明软件是正确的
B.发现错误、降低错误带来的风险
C.排除软件中所有的错误
D.与软件调试相同
参考答案：B
未来通信子网应具备的特征之一是SMDS，它中文含义是______。
It is ________ he said ________ is very important to us.
A．what; that
B．all what; that
C．all that; which
D．which; which
