北京地区输电网额定电压等级有110kV、()、500kV等若干级
A.220kV
B.66kV
C.35kV
D.±750kV
参考答案:A
Stay away from junk food, please. It's bad for us, ______ for children! [ ]
A. possibly
B. especially
C. probably
D. specially
新行为主义者托尔曼(1886~1959)提出刺激和反应之间,即实验变量和行为变量之间存在一个“( )”,这就是有机体的内部因素。
A.平衡变量B.中介变量C.条件变量D.生理变量