Mary .thebookfortwoweeks. A. borrowed B.has...
練習題3.18W
問題詳情:
Mary book for two weeks.
A . borrowed B. has had C. keep D. has bought
【回答】
B
知識點:動詞時態
題型:選擇題
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_____theyaremostinterestedinis______theycanproducemorea...
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.已知各項均不為零的數列{an},定義向量.下列命題中真命題是( )A.若∀n∈N*總有cn⊥bn成立,則數...
問題詳情:.已知各項均不為零的數列{an},定義向量.下列命題中真命題是()A.若∀n∈N*總有cn⊥bn成立,則數列{an}是等比數列B.若∀n∈N*總有cn∥bn成立成立,則數列{an}是等比數列C.若∀n∈N*總有cn⊥bn成立,則數列{an}是等差數列D.若∀n∈N*總有cn∥bn成立,則數列{an}是等差數列...
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命題“若aA,則b∈B”的否命題是( )(A)若aA,則bB (B)若a∈A,則bB(C)若b∈B,...
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下列說法正確的是:( )A.1molN2的質量是14g B.H2SO4的摩爾質量是98gC.H...
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