【多选题】【消耗次数：1】
以下属于离散变量的有（ ）
①
进口的粮食数量
②
洗衣机台数
③
每千人医院床位数
④
人均粮食产量
⑤
城乡集市个数
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①
A.粮食生产者的收入减少，因粮食价格下降
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had locked
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