单项选择题
Which one of the following is the optional part of a business letter?()
A.DateB.Iside addressC.body of the letterD.carbon copy
填空题 由于商品的标准不同,确定的()也有所差异。
问答题 翻译:The banks channel the documents but also give their payment undertaking under the procedure of a documentary collection.
填空题 外商投资企业支付等值()万美元以下差旅费需持出国人员护照、签证原件及复印件,出境机票及复印件。