... double control switch ==> 双控开关 double conversion system ==> 双变换制 double convex ==> 双凸 ...
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... 制 make; manufacture 双变频制 double conversion system 二次变差 quadratic variation ...
double conversion system
双转换系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Double quality certificate system (whole vehicle quality certificate and chassis quality certificate) shall be practiced with respect to the products manufactured by vehicle conversion plants.
对改装厂生产的产品实行双合格证（整车合格证、底盘合格证）制度。
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