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A20B-2000-0840
快速以太網: 快速以太網(Fast Ethernet)也就是我們常說的百兆以太網,它在保 持幀格式、MAC(介質存取控制)機制和MTU(最大傳送單元)質量的前 提下,其速率比10Base-T的以太網增加了10倍。二者之間的相似性使 得10Base-T以太網現有的應用程序和網絡管理工具能夠在快速以太網 上使用。快速以太網是基于擴充的IEEE802.3標準。 千兆以太網:
A20B-2000-0840
聯系人:郭先生
聯系電話:18971415643
座機:027-83238871
傳真:207-61537051
QQ:810334512
②、為用戶提供高質量的電能,反映電能質量的三個參數就是電壓、頻 率和波形。這三個參數必須在規定范圍內,才能保證電能的質量。穩定 電壓的關鍵是調節系統中無功功率的平衡,頻率 的變化,是整個系統有功功率的平衡問題,波形是由發電機決定的; ③、保證電力系統運行的經濟性,使發電成本最經濟。 電力系統是一個分布面廣、設備量大、信息參數多的系統,發電廠發出 電能供給用戶,必須經幾級變壓器變壓才能傳輸。 A20B-2000-0840
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