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The professor requested that all the students ________ the reports at once.
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一只能装2 kg汽油的瓶子(ρ汽油=0.71×10³kg/m³),如果用来装水,则瓶子内水的质量为 [ ]
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Shopping habits in the United Stateshave changed greatly in the last quarter of the 20th century.
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_____ readers said they were going to learn a new language. [ ]
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如图所示,近视眼成因原理是________图,近视眼矫正原理是________图。
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