取消
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解析:A: we should maintain our production at an appropriate speed while keeping the quality control in the production. We cannot afford to speed up our production at the cost of quality. Quality control will inevitably slow down our production. However it is worthwhile. Strict quality control method is in itself a cost-effective measure which will reduce the cost you have spent on the interior products. Of course it is not necessary for us to set quality control in every single step of our production. We can keep quality control in some key procedures or areas of our production. Therefore we can achieve a relatively high speed of production.