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1603年,一位旅居西班牙的法国人说:“我在这里听到一个谚语:本地除白银外,所有东西都价格高昂。”之所以出现这一谚语,主要是因为西班牙 [ ]
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I didn't see your sister at the meeting. If she _____, she would have met my brother. [ ]
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Students are always interested in finding out ________ they can go with a new teacher. [ ]
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800毫升=______升;8.04m3=______dm3.
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已知三阶矩阵的特征值为0,1,2,那么R(A+E)+R(A-E)等于多少?
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