pp/hp510n品质 图coc ep-5000、pc/abs tn-3616q、pp 6523 、tpe s-50afr 、pc h3000r、pa66 a 30 v25、pc/abs dn-7720d、pa66 1000-11、pp j-350、
pbt hn7330n/b、tpu cf40-01pps ps-111-999、pc wh9e441lt 、pei ef1006、abs 1000、pbt 2000-3、eva pepe20、pc rw2407、pc dc-1004、
tpv 121-55w241pp pe220nsc、pa66 a3zm2、coc itx1
the virtual circuit is one of the services provided by the network packet switching (another datagram service), simply said, is through the internal control mechanism of the network, the establishment of virtual logical connection between the host&the user, ensure correct transmission packet with the sequence of communication, before&after establishment&removal of virtual circuit. the perpetual virtual circuit is a virtual circuit that is set up at the initialization of the network,&the virtual circuit is kept. both the x.25 network&the b-isdn provide pvc services. pvc bags are generally forbidden.
pp/hp510n品质 图ppo ag511、etfe tl581(粉)、pp 100met、pc 3113、pa66 e-16822-1b、pc df004xxc、tpee 1148lh、pc 3020u(h)、tpv 8291-85tl、
pc/abs fr3010if、pp hj800rppo gtx909、pa66 103fhs、pc/abs dc8516、pc de0049、tpe dgx6220cl、pp d1026 、tpu 1190a(粉) 、pp p353 、
tpv 241-7p sp179、pbt kp513ug、pp 7533ws
pdx87461
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