正性强化
参考答案:正性强化指某种具体行为的后果,或者说效果是积极的,就能增加该行为重现的概率。
Our physics teacher told us that light _______ faster than sound.
A.travel
B.travels
C.is travelling
D.has travelled
脑外伤中,通常将受力对侧的脑损伤称为()
A.闭合伤
B.接触伤
C.惯性伤
D.冲击伤
E.对冲伤