异步传送模式（ATM—Asynchronous Transfer Mode）是宽带综合业务数字网（B-ISDN—Broadband Integrated Service Digital Network）用于传输、复用和交换的技术，是B-ISDN网络的核心技术。本章中我们将重点介绍ATM的基本原理和ATM交换技术，并在此基础上简要介绍B-ISDN网络的网络结构、用户-网络接口的参考配置、业务特性等主要相关技术。 7.1 ATM与B-ISDN的产生和发展 7.2 ATM基本原理 7.3 ATM交换技术 7.4 宽带综合业务数字网（B-ISDN）
1. To answer correctly is more important than () A. answered quickly B. a quick answer C. quickly answered D. to answer quickly 2.It ( until dark that he realized that it was too late to return home. A. is B. wasn't C. weren''td.were3. Do you remember() Tom about this before? A. to telling B. telling C. to have told D. tell 4. Look, () A. there he goes B. there goes he C. he goes there D. he there goes.It seems difficult () A. to stop the child to crying B. to stop the child of crying C. stopping the child cry D. to stop the child from crying 6.I have never drunk ( beer in my life. A. the better one B. more best C. more better D. better
2000 年 7 月原告 A 公司向 B 公司提供牛皮纸，双方口头约定货到付款。原告按约提供给 B 公司价值为 23000 的牛皮纸。B 公司收货后，签发一张 23000 元的转帐支票给原告。次日， 原告持支票向银行提出付款，因“存款不足，无款支付”遭银行退票。于是原告上门向 B 公 司追款，B 公司称其没钱，等有钱再付进行搪塞。原告在多次与 B 公司交涉无果的情况下 起诉二股东李某
