Buerger试验

I really _____ words with which to express my thanks. [ ]

A. lack of

B. am lacking

C. lack

D. am lacked

中风之发生，病理复杂，其根本在于：

A．气逆血滞

B．肝火心火

C．风痰湿痰

D．肝肾阴虚

E．肝风外风

随着科学技术的快速发展，信息技术已融入我们生活的方方面面。如打电话、看电视等。“十二五”规划纲要将新一代信息技术产业纳入国家七大战略性新兴产业，并实施产业创新发展工程，我国之所以重视新一代信息技术产业，因为： [ ]

A．它利润高，发展快

B．它是基础性产业

C．它改变人们得生活方式

D．它是提高生产效率的有效手段

对注射用油质量论述正确的是（）

A.碘价越高越好

B.皂化值越高越好

C.酸值越低越好

D.熔点越低越好

E.密度越低越好

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 kb/s～512 kb/s in the reverse direction depending on the distance, 12000 or 18000 feet. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL .delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．2 kHz

B．4 kHz

C．16 kHz

D．64kHz