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【简答题】
在NaOH、Na 2 O 2 、H 2 O 2 、CH 4 、KCl中，只有离子键的是（），既有离子键又有极性键的是（），既有离子键又有非极性键的是（），既有极性键又有非极性键的是（），由极性键形成的非极性分子是（）
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举一反三
【单选题】You will hear a short conversation. After listening, there will be a question. When you hear the question, you should decide on the best answer from the four choices marked A,B,C and D.
A.
At the railway station.
B.
At home.
C.
In a shop.
D.
At school.
【单选题】早产的概念是
A.
妊娠满28周至不满37足周间分娩者
B.
妊娠满28周至不满38足周间分娩者
C.
妊娠满27周至不满40足周间分娩者
D.
妊娠满28周至不满40足周间分娩者
【单选题】You will hear a short conversation. After listening, there will be a question. When you hear the question, you should decide on the best answer from the four choices marked A,B,C and D.
A.
She likes the poison.
B.
Different people are interested in different things.
C.
Meat and poison are the same.
D.
People don't know what they like.
【单选题】You will hear a short conversation. After listening, there will be a question. When you hear the question, you should decide on the best answer from the four choices marked A,B,C and D.
A.
White is the most popular color.
B.
No one cares.
C.
No one likes white.
D.
She doesn't care much about the fashion.
【单选题】早产的概念是:
A.
妊娠28周以前分娩者
B.
妊娠28周至37周之间分娩者
C.
妊娠37周至40周之间分娩者
D.
妊娠40周至42周之间分娩者
E.
妊娠42周以后分娩者
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