短語詞組短語sight t letter of credit 即期信用証sight payment letter of credit 即期付款信用証;見票即付信用証Sight irrevocable letter of credit 即期不可撤銷信用証Irrevocable Sight Letter Of Credit 不可撤銷即期信用狀deferred sight letter of credit 延期付即期信用証at sight letter of credit 即期信用証付款by sight letter of credit 即期不可撤消信用証爲付款方式letter of sight credit 即期信用証 返回 sight letter of credit