下列说法中错误的是A某数据的频数即是该数据出现的次数B一组数据中某数据的频数最大则它的频率也最大

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• 1台车床1天能加工零件240个．照这样计算,3台机床8天能加工零件A.5760个B.720个C.1920个D.270个
  
• 63×12÷（38-35）=A.2B.90C.252D.4800
  
• （400-75×2）÷125=A.2B.90C.252D.4800
  
• （72+108÷36）×64＝A.2B.90C.252D.4800
  
• 17的3倍加上20的和,再乘15,积是A.674B.1065C.574D.44
  
• 18与30的积加上216与182的差,和是A.674B.1065C.574D.44
  
• 3600除以40的商,减去23乘2的积,差是A.674B.1065C.574D.44
  
• 860-（450÷9+720)=A.2B.90C.252D.4800
  
• Jack is bad-tempered, selfish and ________ an unpleasant man．A.thereforeB.altogetherC.otherwiseD.anyhow
  
• I as well as they ________ ready to help you when you are in trouble．A.areB.wereC.amD.was