we request to purchase A from your company for the purpose of program testing and we guarantee that the application of this product will be strickly restricted in no other than program testing. 申请在此处用apply没有request好. request:to ask for sth or ask sb to do sth in a polite or formal way 用use不合适.用apply或者其名词apllication才对. apply:to use sth or make sth work in a particular situation即:应用,把.东西应用于.