()是由“GUN’sNotUnix”所递归定义出的首字符缩写语。
A、GRUB
B、CPL
C、GNU
D、GUN
参考答案:C
They promised to develop a software package by the end of this year, ________ they might have.
A.however difficult
B.how difficult
C.whatever difficulty
D.what difficulty
车辆识别代号编码经过排列组合的结果可以使车型生产在30年之内不发生重号现象。