1. Meanwhile, the Ministry also adopted a number of measures to support the development of China Unicom and other operators, since there were in excess of 2,900 approved telecom operators nationwide and over 100 of them were inter-provincial interconnected operators. Over 3.4 million lines of dedicated exchanges owned by more than 800 entities were connected with the public communications networks.  
   同时，采取一系列措施支持中国联通及其他经营单位的发展，全国获准经营电信业务的单位己达2900多个，其中从事跨省联网经营的单位超过100个，有800多个单位的340多万门专用交换机与公用通信网实现联网。
2. In Hong Kong, four cellular phone operators - Hong Kong Telecom CSL Limited, Hutchison Telephone Company Limited, Pacific Link Communications Limited and Smar Tone Mobile Communications Limited -provide cellular phone networks in the 800-900 MHz band, while six PCS operators (Hutchison Telephone Company Limited; Mandarin Communications Limited; New World PCS Limited; P Plus Communications Limited; Pacific Link Communications Limited and Peoples Telephone Company Limited) provide their services in the 1 700-1 900 MHz band. 
   在香港，4家流动电话服务营办商──香港电讯csl有限公司、和记电话有限公司、讯联电信有限公司及数码通电讯有限公司──利用800-900兆赫频段提供流动电话网络。6家个人通讯服务营办商(即和记电话有限公司、汇亚通讯有限公司、新世界流动电话有限公司、八方通讯有限公司、讯联电信有限公司及万众电话有限公司)则利用1700-1900兆赫频段提供服务。
3. 3.1.16 A compendium of operators 
   3.1.16运算符总结
4. perturbation theory for linear operators 
   线性算子扰动理论
5. The relational operators == and! 
   关系运算符==和!

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