在国家和有关部门颁发的一系列管道及其附件技术标准中,()、()是两个最基本参数。
参考答案:公称直径;公称压力
1) ______ the Oral Approach 2) ______ the Grammar-Translation Method 3) ______ the Communicative Approach 4) ______ the Cognitive Approach 5) ______ the Natural Approach a) Krashen’s monitor hypothesis b) behaviourist habit-formation theory c) innate organizing principles d) language as communication e) Faculty Psychology