【单选题】According to the author, mathematics is ______.
B.
in need of simple verification
D.
based on fact and theory
【单选题】因子分析中,各变量间的相关矩阵中的大部分相关系数( ),则不适合作因子分析
【单选题】关于椎管内麻醉对呼吸的影响,下列哪项是错误的
E.
高位硬膜外阻滞,用药浓度较高,对呼吸也不会产生严重影响
【简答题】The Direct Method believes in the______process of language learning and in the inductive teaching of grammar.