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【简答题】
从亲和沉淀的机理和分离操作的角度出发,简述亲和沉淀纯化技术的优点。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列化合物按照沸点降低顺序排列 1 )丁烷 2 )己烷 3 ) 3- 甲基戊烷 4 ) 2,3- 二甲基丁烷
A.
1>2>3>4
B.
2>3>4>1
C.
1>3>2>4
D.
2>3>1>4
【单选题】下列化合物进行S N 2反应速率由大到小的顺序为: 1 1-溴丁烷 2 2,2-二甲基-1-溴丁烷 3 2-甲基-1-溴丁烷 4 3-甲基-1-溴丁烷
A.
②>③>④>①
B.
④>①>②>③
C.
①>④>③>②
D.
④>②>①>③
【单选题】At a formal dinner, the fork should be placed __________.
A.
beside the plate when the course is served.
B.
to the right of the butter knife
C.
to the left of the butter knife.
D.
next to the soup spoon
【简答题】将下列化合物按照沸点降低的顺序排列: ( 1 )丁烷 ( 2 )己烷 ( 3 ) 3- 甲基戊烷 ( 4 ) 2- 甲基丁烷 ( 5 ) 2 , 3- 二甲基丁烷 ( 6 )环己烷
【单选题】How should the girl have her main course?
A.
With knife only.
B.
With fork only.
C.
With knife in the right hand and fork in the left hand.
D.
With knife in the left hand and fork in the right hand.
【简答题】试述电路的分类及功能。
【多选题】How should we use a fork in Thailand?
A.
You shouldn't put the fork in your mouth.
B.
You may use it to push food onto your spoon.
C.
You may use it to eat noodles.
D.
You may use it together with chopsticks.
【单选题】When you have western food, you should use knife and fork properly . The underlined part means “_________”.
A.
in a quick way
B.
in the right way
C.
in a different way
D.
in the usual way
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