购买机车时合格证不能丢有些机手买了新拖拉机不重视对机车合格证的保存，往往拖拉机开出仓库，合格证就丢失了，给今后办理牌、证带来麻烦。合格证是部颁有生产许可证厂家产品出厂的凭证，它标有机车产地、时间和编号，同车辆来历凭证一样。都是机车牌、证档案中不可缺少... Buying a locomotive certificate can not be lost when some traders bought a new tractor does not attach importance to the preservation of the locomotive certificate, tractor often out of the warehouse, certificate is lost, for the future card, permit trouble. Certificate of compliance is issued by the ministries and licensing manufacturers of products factory certificate, which marked the locomotive origin, time and number, the same credentials from the same vehicle. Are the license plate, card file indispensable ...