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A5760个B720个C1920个

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• 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
  
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