We won't be able to send you the brochure this month. You are requested to make us the most favorable offer, stating origin, packing detailed specifications, quantity suppliable and the earliest time of shipment. Please let us know what you wish us to do about this matter as soon as possible. We acknowledge with thanks to the receipt of your letter of July 1. Because our book is full, so we cannot entertain any more orders. We have received with thanks your check. The amount has been placed to your credit. 请分别指出以上各个句子的表达方式分别违背了什么原则?