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请简述管渠检查的意义？

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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？

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.