它们通过降低买卖价差改善了交易所的价格质量。
They improve the quality of the prices on the exchanges by lowering the bid-ask spread.
采用差额公式法调价操作比较简单，可以很容易得出实际价差，对工程的施工质量起到一定的控制作用。
Balanced error formula method is easier to operate price adjustment and draw the conclusion of practical price gap. It makes definite utilization of control for project construction quality.
当中国的制造商认识质量才是最重要，而不得不提高他们的成本投入这一问题时，中国工厂与意大利工厂使用的产品的价差将逐渐缩小。
The price gap between Chinese and Italian plants is gradually closing as the Chinese manufacturers realise that quality is expensive and are forced to raise their prices.
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