A. 心理分析 B. 行为主义 C. 人本主义 D. 认知理论
A. 正确 B. 错误
A. TRAG B. TRAD C. TGT09 D. TGT18
A. varying the DC exciter voltage B. varying the reluctance of the air gap C. regulating the speed of the prime mover D. shorting out part of the armature winding