漏电保护器对下例哪种情况不起作用()
A.单手碰到带电体
B.人体碰到带电设备
C.双手碰到两相电线(此时人体作为负载,已触电)
D.人体碰到漏电机壳
参考答案:C
实现一定水量的位置迁移,满足用水的地点要求,称为()。
A.水量输送
B.水压调节
C.水量调节
D.水量满足
1) ______ Verbal Behavior (1957) 2) ______ Notional Syllabuses (1976) 3) ______ The Principles of Language Study (1921) 4) ______ Guide to Patterns and Usage in English (1954) 5) ______ The Natural Approach: Language Acquisition in the classroom a) Harold Palmer b) Tracy Terrell c) B. F. Skinner d) A. S. Hornby e) D. A. Wilkins