A:FTP
B:TELNET
C:HTTP
D:TCP/IP
设变量x,y满足约束条件{y≥xx+2y≤2x≥-2,则z=x-3y的最小值为( )
How would you deal with the problem? How about asking our teacher for help?
读我国土地资源分布图,回答下列问题。
There is going to _________ a storm.