【单选题】The______in our soaps should come only from essential oils, which are steamed or pressed from plants.
【简答题】跳汰选矿、跳汰机、跳汰床层、脉动水流、跳汰周期、跳汰周期曲线、水流冲程、冲次等基本概念
【简答题】A.It was first boiled and then dried. B.It was braided in bundles and steamed. C.It was dried and then ground into flour. D.It was roasted and wrapped in husks.
【判断题】在虎门海滩当众销毁鸦片的清朝政府大臣是林则徐。