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【简答题】
常用的吸吸附指示剂都是______化合物,在水溶液中可以电离出具有一定颜色的______离子,这些_________离子很容易被带________电荷的胶体沉淀吸附,吸附后__________改变,从而引起___________变化来指示滴定终点。
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皮皮学刷刷变学霸
举一反三
【单选题】At a formal dinner, the fork should be placed __________.
A.
beside the plate when the course is served
B.
to the left of the butter knife.
C.
next to the soup spoon
D.
to the right of the butter knife
【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】How should we use the fork and knife?
【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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