填空题

Dear Sirs,
Your company, Euro Cotton import, has been introduced to us by Smith & Co., London, as a large buyer of Chinese cotton products. These articles come within the scope of our business activities, and we shall be pleased to enter into business relations with you.
To give you a general idea of the various types that are at present available for export by us, we enclose a specification list and shall be glad to send you samples and quotations upon receipt of your specific enquiry.
Our terms of payment are by a draft at sight under L/C. All the products exported by us are of fine quality and at low price.
We look forward to your early reply.
Yours faithfully,
Jack Lee, sales manager What is the term of payment By a draft ______ under L/C.