搜题请搜索小程序“爱下问搜题”
问题 单项选择题

自总皂苷中分离甾体皂苷可选用

A．乙醚沉淀法

B．胆甾醇沉淀法

C．铅盐沉淀法

D．吉拉尔试剂提取法

E．碱水提取法

答案

参考答案：B

解析：甾体皂苷可以和胆甾醇形成不溶于水的分子复合物沉淀。

改错题
短文改错。
     此题要求改正所给短文的错误。对标有题号的每一行做出判断：
     如有错误(每行只有一个错误),则按下列情况改正:
     该行多一词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
     该行缺一个词:在缺词处加一个漏字符号(),在该行右边横线上写出该加的词。
     该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
     注意:原行没有错的不要改。
Next I am going to talk about your study tour abroad. 
According to an agreement, we had decided to send 30 students 
and teachers to have a study tour in London in next week. Now I'd like 
to tell you something about our group or what we'd like you to do. Our
group is made up of two women teacher and 28 students, about half
of them are boys. We'll stay in host families so that we can have
opportunities to improve our speaking English. As to activities,
in the morning they will have two English classes, and do some sightseeing 
in the city. In the afternoon, we can have some freely time. 
On Saturday we're going to pay visit to the British Museum. 		1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____                 
10. _____
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多项选择题

旅行社的全面质量管理，要求企业管理者要从（）进行全面的考察。

A.硬件设施质量

B.产品质量

C.服务质量

D.环境质量

E.市场宣传质量
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