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By comparison with some traditional differentiation methods, such as divided differences, by-hand coding and symbolic differentiation, AD is characterized by a lot of virtues, e.g., truncation error free, less running cost and less human labor required.

比起传统意义上的计算微分方法来，自动微分具有计算精度高、计算代价小及投入人力少等优点。

Business Scope: 1, various types of headsets: headset after headset linked, linked ear headphones, headphones and other dedicated Internet bar; 2, various types of earplugs: MP3/MP4 earphone, recorder / repeat machine earplugs, ear plugs, such as radio; 3, various types of communications headsets: cell phone hands-free headset, headset walkie-talkie, etc.; 4, various types of special headphones: aviation headset, video game consoles with headphones, headphones for simultaneous interpretation, voice headsets and so on; 5, various types of microphones: a portable microphone , hand-held microphone, desktop microphone, etc.; 6, various types of headphones and microphone accessories: headphones finished wire, ear shell / shell microphone, speakers / potentiometers, PCB board, etc.; 7, various types of headphones and microphone processing business , to undertake OEM / ODM orders; 8, various connectors of the processing operations, to undertake OEM / ODM single.

业务范围： 1、各类耳机：头戴式耳机、后挂式耳机、耳挂式耳机、网吧专用耳机等； 2、各类耳塞：MP3/MP4耳塞、录音机/复读机耳塞、收音机耳塞等； 3、各类通讯耳机：手机免提耳机、对讲机耳机等； 4、各类特种耳机：航空耳机、游戏机用耳机、同声传译耳机、语音耳机等； 5、各类麦克风：便携式麦克风、手握式麦克风、台式麦克风等； 6、各类耳机及麦克风配件：耳机成品线材、耳壳/咪壳、喇叭/电位器、PCB板等； 7、各类耳机及麦克风的加工业务，承接OEM/ODM单； 8、各类接插件的加工业务，承接OEM/ODM单。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。