题目:
一台机床生产一种零件,5天内出现次品的件数为: 1,0,1,2,1。则出现次品的方差为( )。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A解析:Most foods contain limited amounts of fluoride. However, tea contains a significant amount of fluoride and would be the most appropriate suggestion.