公文按行文方向可以分为____、____、____ 。
A.下行文
B.上行文
C.平行文
D.发文
Now Martin is at Shanghai Excavation Machinery. Is this Martin's first face-to-face meeting with LiMing? How do you know? Listen and find out.
如何快速切换到用户mxz的主目录下?
A. cd@mxz
B. cd
C. Jmxz
D. cd&mxz
E. cd~mxz
哪个目录存放着Linux的源代码?
A. /etc
B. /usr/src
C. /usr
D. /home