二、产品标准与东京回合守则应当承认,构成不遵守国民待遇规则的第20条“一般例外”,其本身确有它一定的合理性,但是由于它引言中的含糊措词,使得常常界限不清或难以划清,带来许多麻烦。在实践中日益集中表现为“产品标准”问题。(一)问题的缘由1.产品的卫生、安全与技术性能最常发生也最难处理的是食品与药品的卫生与安全标准。例如,在美国与加拿大交界 2. The product standard and the Tokyo Round Code should recognize that the “general exception” to Article 20 that constitutes non-compliance with the rules of national treatment does indeed have its own certain rationality, but because of the vague wording in its introduction, the boundary is often not Clear or difficult to draw, bring a lot of trouble. In practice, the problem of “product standards” is increasingly concentrated. (I) Causes of the problem 1. The health, safety, and technical performance of the product are the most common and most difficult to handle. They are the standards for food and drug hygiene and safety. For example, at the junction of the United States and Canada