负强化的办法有（）
A.批评
B.处分
C.降级
D.少给奖励
E.发奖金
参考答案：A, B, C, D
CDMA2000 1x系统反向外环功率控制速率为（）赫兹。
A.50
B.400
C.800
D.以上都不对
Which of the following nursing diagnoses would be most appropriate when teaching the mother of a toddler()
A. Activity intolerance.
B. Risk for injury.
C. Delayed growth and development.
D. Impaired mobility.
