通用式机车信号信号线输出总电流不超过（）A。
A.0.3
B.0.4
C.0.5
D.0.75
参考答案：B
Stimulus, response and reinforcement is behavioural psychology used in ______in language teaching.
A. the Direct Method B. the Natural Approach C. the Cognitive Approach D. the Audiolingual Method
炔诺酮（）
A.
B.
C.
D.
E.
