【简答题】【消耗次数:1】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[vain; frame; curve; twist; comb; collapse; scatter; scratch; rebuild; harsh]5. The horses liked this grooming, and I think, if they could talk, they would tell you where to[填空1]or comb.
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随机题目
【单选题】 非异常维管束所形成的性状特征是
①  车轮纹
②  罗盘纹
③  云锦花纹
④  星点
【单选题】 中药气调养护法的主要目的是
①  充氮
②  充二氧化碳
③  充氧
④  降氧
【单选题】 一般药材取样量
①  25g
②  100~500g
③  5—10g
④  50g
【判断题】 吸附色谱法分离生物碱常用的吸附剂是硅胶
①  正确
②  错误
【判断题】 水溶性生物碱分离的常用方法是雷氏盐沉淀法
①  正确
②  错误
【判断题】 生物碱的薄层色谱和纸色谱法常用的显色剂是改良碘化铋钾
①  正确
②  错误
【判断题】 碱性不同生物碱混合物的分离可选用pH梯度萃取法
①  正确
②  错误
【判断题】 碱性较强的生物碱在植物体内的存在形式多为无机酸盐
①  正确
②  错误
【多选题】 用乙醇提取生物碱可提出
①  游离生物碱
②  生物碱无机酸盐
③  生物碱有机酸盐
④  季铵型生物碱
⑤  两性生物碱
【多选题】 常用于检识生物碱的试剂是
①  碘化铋钾试剂
②  醋酸镁试剂
③  碘化汞钾试剂
④  雷氏盐试剂
⑤  苦味酸试剂