If the mass of 1 cubic centimeter of a certain substance is 7.3 grams, what is the mass, in kilograms, of 1 cubic meter of this substance? （1 cubic meter = 1,000,000 cubic centimeters; 1 kilogram = 1,000 grams）
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A0.0073
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B7.3
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C7.3
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D7,300
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E7,300,000
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正确答案: D