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It's white. It's white cup. A. a; / B. /; a C. a; a D. /; /
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Theelephantistheonlyanimalintheworldwithatrunkt
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AccordingtothetexttheWhiteHouse
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warned its departments of the new attack.
was unable to assess the situation correctly.
Theelephantistheonlyanimalintheworldwithatrunkt
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Theelephantistheonlyanimalintheworldwithatrunkt
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Theelephantistheonlyanimalintheworldwithatrunkt
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根据光线的方向分别在下图的方框中填上一个适当的透镜.
怎样判断一个透镜是凸透镜还是凹透镜请说出你的方法.怎样可以测得一个凸透镜的焦距请说出你的方法.
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画出下列各图中入射光线或折射光线
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body A.over B.robot C.problem
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画出下列各图中入射光线或折射光线
Lastmonthwedidasurveyandfindthatsomestudentsdon'texerciseatall.
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