上海光明厂生产的光明牌重力选种机,选种质量好,深受用户欢迎。但由于很多用户对该机原理和操作技术了解不够,经常出现选种质量欠佳等问题。为此,现将我场近三年来使用该机的一些体会作以介绍。 Light factory in Shanghai Guangming licensing gravity grading machine, selection of good quality, welcomed by users. However, due to the fact that many users do not know enough about the principle and operating technique of the aircraft, problems such as poor selection of quality often occur. To this end, now I field nearly three years to use some of the aircraft to make a presentation.