Objective : To illustrate the killing effects avermectin on Leptotrombidium deliense on tropical coral islands.目的: 观察生物杀螨剂阿维菌素在热带珊瑚岛上对地里纤恙螨成虫杀灭效果.He lay on a coral beach where the cocoanuts grew down to the mellow - soun...
彩涂板; 钢结构; 异型钢制品制作、加工.Caitu; structural steelwork; Heteromorphosis steel products manufacturing and processing.后臂和前臂上的主要凸缘都使用铸钢制品.Casting steel products are used for main flnges on boom and arm.铌是制造超导钢制品的一种软金属.Niobium is ...