皮皮学，免费搜题
登录
搜题
【多选题】
下列属于萃取系统优点的是A.
直接从 cell碎片匀浆中萃取prot、而无需将细胞碎片分离
B.
系统平衡时间短，含水量高，界面张力低，聚合物对蛋白质有稳定作用，为生物活性物质提供了温和的分离环境
C.
操作简便，经济省时，易于放大
D.
改变体系的 pH和电解质浓度可进行反萃取
E.
温度对萃取得率影响比较小，一般可在常温操作，不需冷却，活性成份收率很高。
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
【单选题】To help older children establish a healthy attitude towards competition, families and schools should encourage them to _____.
A.
take part in some art programs
B.
compete against themselves instead of against one another
C.
engage more in competition among family members
D.
seek professional advice on how to compete well
【简答题】read the three paragraphs below and choose the sentence that is the main idea of the paragraph. _______1. (1) Often when older children move back home, unpleasant tensions and disagreements arise. (2)...
【简答题】Some people say that older people should live with their children. Others say that they shouldn't. Which do you think is good practice. In the first part of your writing you should present your ...
【简答题】Passage 15 When couples get married, they usually plan to have children. Sometimes however, a couple cannot have a child of their own. In this case, they may decide to adopt a child. In fact, adoption...
【单选题】The following selections have topic sentences (main ideas) that may appear at any place within the paragraph. Identify the topic sentence of each paragraph by choosing the answer with correct sentence...
A.
Sentence 1
B.
Sentence 2
C.
Sentence 6
D.
Sentence 8
【简答题】Passage 15 When couples get married, they usually plan to have children. Sometimes however, a couple cannot have a child of their own. In this case, they may decide to adopt a child. In fact, adoption...
【单选题】下列关于投资项目风险处置的调整现金流量法的说法错误的是( )。
A.
在调整现金流量法下，折现率是指不包括非系统性风险，但包括系统性风险的折现率
B.
现金流量的风险越大，肯定当量系数就越小
C.
投资者越偏好风险，肯定当量系数就越大
D.
通常肯定当量系数的确定与未来现金流量的标准差有关，但是标准差是估算的结果，很容易产生偏差
相关题目：
参考解析：
知识点：
题目纠错 0
发布
