皮皮学，免费搜题
登录
搜题
【多选题】
沉淀试剂和显色剂鉴别生物碱时,要注意反应条件和排除干扰,下列说法正确的是( ) 。A.
试剂常对一些非生物碱类成分同时能起阳性反应，造成假阳性。
B.
碘化铋钾除了可以与生物碱产生沉淀外，还可以与萜类、内酯、香豆素、等具有共轭羰基的非含氮物质产生阳性反应。
C.
非含氮杂环的生物碱（如麻黄碱、秋水仙碱），与某些生物碱沉淀试剂不反应。
D.
季胺类生物碱未被提出，而造成假阴性。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】Three factors to be determined during the warehouse design process are the number of floors to include in the facility, a cube utilization, and __________ 。
【简答题】What three factors must be considered in the transmission of a suce wave to reduce attenuation?
【简答题】Upon departure, please switch off / turn off the air-conditioner. (英译汉)
【简答题】How many people you (employ)?
【单选题】梁女士,55 岁,外阴瘙痒严重,妇科检查发现大阴唇、阴唇间沟、阴蒂皮肤纹理明显突出、增厚,并有苔藓样变,为确诊此病,应做的检查为
A.
诊断性治疗
B.
外阴活组织病理检查
C.
阴道分泌物检查
D.
测血糖
E.
根据临床表现即可确诊
【单选题】Book clubs are a great way to meet new friends or keep in touch with old ones,while keeping up on your reading and participating in lively and intellectually stimulating discussions.If you’re interest...
A.
focus exclusively on one genre
B.
have guidelines about where and when to meet
C.
have a focus
D.
decide how to choose and who will choose book selections
相关题目：
【简答题】What three factors must be considered in the transmission of a suce wave to reduce attenuation?
参考解析：
知识点：
题目纠错 0
发布
