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 商务签证邀请函范文篇一   invitation letter  商务签证邀请函  executive director, product development training school improvement solutions bbb learning  xxth september xxxx  to whom it may concern,  dear sir/madam,  we hereby officially invite the following delegation of bbblearning to visit our school in china, for further business discussion and business cooperation.  delegation member:  full name:xxx  gender: male dob: may xx, xxxx  passport number: xxxxxxx expiry date: xx dec xxxx  vi