Network managers have long awaited practical voice-over-IP (VOIP)solutions. VOIP promises (71) network management and decreases costs by (72) a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’ s head -quarters with far -reaching branch offices can (73) tremendous amounts of (74) in long distance phone bills, provided that solution delivers POTS -like voice (75) over the Internet.

（73）处填（）。

A．get

B．put

C．save

D．waste

在AIX系统中，用来压缩文件的命令是（）。

A.ls

B.compress

C.compare

D.cp