- 1、FIRfilerisabasicprocessingunitfordigitalsignalincommonuse.2、Thepatentnumbers-Chinaisnowthenumbertwopatentfilerintheworld,pastJapan.3、Thisrequiresevaluatingwater-bearingformationsintheiroperationasfilerplants.4、Eitherway,anadministratorneedstoun...
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