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【单选题】
下列化合物中，既含有离子键又含有共价键的是( )A.
H 2 O 2
B.
Na 2 O
C.
CO 2
D.
NaOH
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【单选题】—I wonder if I could use your phone. —____________.
A.
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B.
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C.
Sorry,it’s out of order
D.
No wonder,here it is
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A.
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B.
I don'tknow
C.
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D.
I don't care
【简答题】quiz 4
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