Single-source procurement, also known as direct procurement, is a non-competitive procurement method, that is, the procurement agency only purchases from one supplier. Article 3 1 of the Government Procurement Law stipulates the case of single-source procurement: (1) only purchasing from a single supplier; (2) Unable to purchase from other suppliers due to unforeseen emergencies; (3) It is necessary to ensure the consistency of the original purchased items or the requirements of supporting services, and it is necessary to continue to purchase from the original suppliers. The total amount of additional funds shall not exceed 65,438+00% of the original contract purchase amount. Among them, the patented technology can only be purchased from a single supplier, so the answer is B.