题型:名词解释 下列关于没药的描述不正确的是()A.橄榄科植物地丁树、哈地丁树树干皮部渗出的树脂B.主产于非洲东北部、阿拉伯半岛南部及印度等地C.呈不规则颗粒性团块,气香而特异D.主要含酯树脂E.质坚脆,破碎面不整齐 查看答案
题型:名词解释 下列实验能达到预期目的的是[ ]①用硝酸钡溶液鉴别硫酸根离子与亚硫酸根离子;②用溴水检验汽油中是否含有不饱和链烃; ③用乙醇从碘水中萃取碘; ④用盐析方法分离提纯蛋白质;⑤用加热方法提纯含有少量碳酸氢钠的碳酸钠固体; ⑥用氨水清洗试管壁附着的银镜。A.②④⑤B.①③⑥C.①②④⑤D.②③④⑤⑥ 查看答案
题型:名词解释 The premier minister ordered that he ______ of everything that is going and required that all the working staff _______this order. [ ]A. would be informed; would obey B. be informed; obey C. should inform; should obey D. had been informed; obeyed 查看答案