计算机软件按其用途及实现的功能不同可分为系统软件和应用软件两大类。
参考答案：对
腰椎间盘突出症腰骶试验阳性的是（）
A.Jackson压头试验
B.骨神经牵拉试验
C.直腿抬高试验
D.拾物试验
E.摇摆试验
-— How far apart do they live?
---- _______ I know，they live in the same neighbourhood．
A．As long as
B．As well as
C．As far as
D．As often as
