回纥族是今天一个少数民族的祖先，这个民族是[ ] A．藏族 B．白族 C．彝族

下列台并同类项中，正确的是（　　）

A．3a-4b=4ab

B．3ab-3ba=0

C．5x²+3x³=8x⁵

D．4x²y-5xy²=-x²y

Frame Relay is simplified form of (71) , similar in principle to (72) , in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as (73) . Most Virtual Circuits are (74) ,which means that the network provider sets up all DLCI connections at subscription time. (75) are also part of the Frame Relay specification . They privide a link that only lasts only as long as the session.

A．DLCIs

B．HDLCs

C．SDLCs

D．DLs

紫外线硫化氢分析仪广泛应用于天然气管道对H2S进行在线连续监测.

阅读材料，完成21～23题。（10分）

21．用斜线(／)给下面的文言文中划线处断句(限6处)。(6分)

太史公曰：《春秋》推见至隐，《易》本隐之以显，《大雅》言王公大人而德逮黎庶，《小雅》讥小己得失其流及上所以言虽外殊其合德一也相

如虽多虚辞滥说然其要归引之节俭此与《诗》之风谏何异！

(节选自司马迁《史记》)

22．简要说明《大雅》《小雅》《诗》这三者的关系(2分)

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23．写出这段文字中“相如”的全名和朝代。 (2分)

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磁带格式TS1130和LTO哪种是开放技术的（）。

A、TS1130

B、LTO

C、两个都是

D、两个都不是