The principle governing foreign trade is "clients first , reputation premier".
外贸工作的原则是客商第一，信誉第一。
This paper introduces the fan's principle and ways saving electricity by governing speed.
介绍通风机通过调节速度节省电能的原理和方法。
This paper introduces the fan's principle and ways saving electricity by governing speed.
介绍通风机通过调节速度节省电能的原理和方法。
应用推荐