The principle, structure, technical feature and result of industrial test of the2ZKQ1230 type siring vibration screen were, introduced in this paper. 介绍了2ZKQ1230型直线振动琴弦筛的工作原理、结构特点、技术特征以及工业性试验结果。
A simple blood test can then determine which of the new-born offspring have the high-protein version of the gene, enabling farmers to pick out the'stars '-for both milk production and siring. 简单的血液测试就能够辨别出哪头出生的牛犊含有这种高蛋白基因,使奶农们能够容易地挑选出这些“明星”&不论是在产奶还是配种方面。
Selfing will be favored if it increases seed set when pollen is limiting ( reproductive assurance) or increases siring success when pollen devoted to selfing is more likely to accomplish fertilization than pollen devoted to outcrossing ( automatic selection advantage). 而如果进行自交的花粉比异交花粉更易获得使胚珠受精的机会,那么自交也可以提高植物的雄性适合度(自动选择优势)。