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| | |  | Наименование: | Focus on Grammar – 2Ed High-Intermediate Course for Reference and Practice Answer / key | Формат: | мягкая обложка | Автор: | Bonner M. | Издательство: | Pearson Education (Longman) | Год: | 2000 | Цена: | | | |
| The "Focus on Grammar" series is a five-level course, Introductory through Advanced. Clear, communicative, and teachable, "Focus on Grammar: A High-Intermediate Course for Reference and Practice" provides enough context, practice, and interaction to make any classroom come alive. "Focus on Grammar" features: From Grammar to Writing sections included in all levels. Clear visual presentation of grammar Concise grammar explanations. Comprehensive review tests including TOEFL Test-style questions. Fully contextualized grammar presentation and practice in all four skills. Controlled and communicative practice. New information gap activities throughout each books.
Evaluating the GPRS Radio Interface for Different Quality of Service... Figure 8 i ves iga es he impac of he maximum umber of GPRS user per cell o he performa ce of GPRS for he dy amic cha el alloca io scheme wi h 1 PDCH reserved. Of course, he expec ed umber of GPRS users should be less ha he maximum umber i order o avoid he rejec io of ew GPRS sessio s. O he o her ha d, he maximum umber of ac ive GPRS sessio s mus be limi ed for guara eei g quali y of service for every ac ive GPRS sessio eve u der high raffic. he radeoff be wee i creasi g performa ce for allowi g more ac ive GPRS sessio s a d he i creasi g blocki g probabili y for GPRS users is illus ra ed by he curves of Figure 8. Co clusio s his paper prese ed a discre e-eve simula or o he IP level for he Ge eral Packe Radio Service (GPRS). Wi h he simula or, we provided a comprehe sive performa ce s udy of he radio resource shari g by circui swi ched GSM co ec io s a d packe swi ched GPRS sessio s u der a s a ic a d a dy amic cha el alloca io scheme. I he dy amic scheme we assumed a reserved umber of physical cha els perma e ly alloca ed o GPRS a d he remai i g cha els o be o -dema d cha els ha ca be used by GSM voice service a d GPRS packe s. |