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问题 单项选择题

洁净室的送风必须是洁净度很高的空气，为保护终端过滤器，空气必须先经过滤，该过滤器应选用（）。

A.高效过滤器

B.中效过滤器

C.亚高效过滤器

D.亚中效过滤器

答案

参考答案：B

单项选择题 A1/A2型题

男，27岁，外伤后尺腕部疼痛，结合图像最可能的诊断是（）

A.未见异常

B.三角骨无菌性坏死

C.三角骨骨折

D.尺骨骨折

E.三角纤维软骨复合体裂伤
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单项选择题

Network managers have long awaited practical voice-over-IP (VOIP) solutions. VOIP promises ease network management and decreases (1) 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 (2) tremendous amounts of money in long distance phone bills, provided that solution delivers POTS-like voice (3) over the Internet.

VOIP gateways are designed to convert voice from the (4) 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 (5) H.323 standard defined by the International Telecommunication Union, or ITU.

4（）

A．framing

B．message

C．circuit

D．packet
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