二、我國與美國於二00九年十月二十九日簽訂 Protocol of Bovine Spongiform Encephalopathy (BSE)-Related Measures for the Importation of Beef and Beef Products for Human Consumption from the Territory of the Authorities Represented by the American Institute in Taiwan (AIT)《台美牛肉輸入議定書》,依據上開事實,試回答以下問題:(34%)
(一)、《台美牛肉輸入議定書》締約主體為何?其法律性質為何,就國際法及我國內國法之規定敘述之。