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在开槽施工的管道铺设过程，如何进行对中和高程控制？

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You will be satisfied （)the quotation because we have offered you a 3% discount for each item. You may rest assured that we shall effect shipment （)the receipt of the credit.

As a manufacturer of beauty tools （)nearly 20 years, A & C Co., Ltd, has built a repuation for outstanding manufacturing and support.

As agreed （)in our negotiations, payment is to be made by letter of credit.

If possible, please arrange early shipment of this order, as we are badly （)need of the goods.