摘要: 柞树生长多年后,若不合理修剪,会枝干老化,树势衰弱,发芽力减退.修剪柞树具有增加叶量,提高叶质和恢复树势的作用.合理规划柞蚕场,科学修剪柞树,有利于提高柞蚕场单位面积产茧量,既增加经济收入,又保护柞蚕场生态环境.关键词:修剪要点 柞树 柞蚕场 合理修剪 合理规划 单位面积 经济收入 生态环境 ...
A reactive polyurethane mixture is applied by a high pressure airless spray applicator directly onto the primary backing of a moving substrate such as a carpet web. The applied reactive mixture is allowed to foam to an approximate predetermined thickness and density. While the blown or foamed back...
PROBLEM TO BE SOLVED: To provide an apparatus for reducing the occurrence of a weaving bar caused by the stop of a loom. SOLUTION: This apparatus for preventing a weaving bar of a loom is obtained by connecting a holding device 40 to a weight lever 23 so that the rotation of the weight...