【正确答案】(1) Letter of credit belongs to bank credit. As long as the beneficiary presents the stipulated documents in conformity with the L/C, the issuing bank of the L/C must make the payment firstly.
   (2) Banks deal with documents. In letter of credit business, banks deal in documents, not goods or services.
   (3) A letter of credit is a self-sufficient document. Letter of credit is opened on the basis of the contract, and independent from the contract once it is opened.