Network managers have long awaited practical voice-over-IP (VOIP) solutions. VOIP promises ease network management and decreases (66) by converging 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 (67) tremendous amounts of money in long distance phone bills, provided that solution delivers POTS-like voice (68) over the Internet.
VOIP gateways are designed to convert voice from the (69) domain to the circuit switched domain. VOIP solutions use a digital signal processor (DSP) to process the voice data, preparing the voice sample for transmission by compressing voice and removing jitter. The VOIP equipment must comply with the (70) H.323 standard defined by the International Telecommunication Union, or ITU.

A．time

B．cash

C．costs

D．space

皮肤黏膜淋巴结综合征最具特征性的表现是

A．原因不明的持续高热5天以上

B．向心性、多形性皮疹

C．手足硬性水肿，热退时出现指、趾端膜状脱屑

D．淋巴结肿大

E．口腔咽部黏膜呈弥散性充血