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问题 单项选择题 A1/A2型题

抗体分子中能与FITC异硫氰基结合的基团为（）

A.羧基

B.羟基

C.氨基

D.醛基

E.糖基

答案

参考答案：C

解析：FITC异硫氰基能与抗体的氨基结合形成稳定化学键。

单项选择题

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．channel

B．computation

C．speed

D．bandwidth
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单项选择题

下列电力负荷中（）为一级负荷。

A、蒸发量大于10T/h锅炉用鼓风机

B、大型冷库压缩机

C、民用机场候机楼

D、高档电影院
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