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最佳答案:Last week we did a survey of the readers about good places in our city. And this
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最佳答案:回收率是回收分数占总数的数额,即:468/500x100%=93.6%有效率是有效份数占回收分数的数额,即:452/468x100%=96.58%
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最佳答案:Recently,we did a simple report on the places in our city with the classmates in