It consists of a far more restrictive list of conditions to validate the KDC's certification, predominantly it needs a KDC certification with the EKU of “KDC Authentication” (see option b. above). 雅思考试和四六级应试考试不同，主要是能力型考试，主要考察，解题+科目能力+词汇+语法+逻辑，所以四、六级基础差的也不用担心。 这样，一来也安心，知道自己到了哪个水平，二来之后的改进也更有针对有效... https://gregory83693.p2blogs.com/34559557/the-best-side-of-雅思证书全称