21.As we all know.there is electric field inside earth. A.an,不填 B.an,the C.the,the D.不填,不填 查看更多

 

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As we all know,there is ________electric field inside ________earth.

A.an;不填         B.an;the          C.the;the         D.不填;不填

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As we all know,there is ________electric field inside ________earth.

  A.an;不填      B.an;the    C.the;the      D.不填;不填

 

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