写商务信函的一般要点答:(Conciseness, Clearness, Courtesy)发展到目前的7 个"C":Completeness(完整), Clearness(清晰), Concreteness(具体), Conciseness(简明), Correctness(正确), Courtesy(礼貌), Consideration(体谅) 实例 Dear Sirs, With reference to your letter of April 9, we are pleased to accept your offer of 100 tons...