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闭域必为闭集
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若重极限不存在，则累次极限不存在
若f(x,y)不连续，则f(x,y)对x和y都不连续
填阿拉伯数字：In August 2003, Europe, particularly France, had one of its worst heatwaves ever. The temperature was sometimes more than degrees. Because of this, many people died. On one night, August 10th, between and people died. In total, more than people died in Europe, including in France.
数控车床与普通车床相比，在结构形式上最大不同之处在( )上。
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