[名词解释] 土壤侵蚀分类原则

传统理论认为，正常的行政组织结构应该是（） ["金字塔型","棱柱型","倒三角型","纺锤型"] 种子净度检验结果要求保留（）位小数。 ["0","1","2","3"] 手提氧气瓶的的正常压力为（） ["1600PSI","1700PSI","1800PSI","1900PSI"] 种子纯度检验最准确的方法是（） ["田间小区种植鉴定","幼苗鉴定","种子形态鉴定","电泳法鉴定"] 旅客氧气面罩有几种脱落方式（） ["2种","3种","4种","5种"] 土壤侵蚀分类原则