A321飞机旅客服务组件的简写为()
A.PTP
B.PTU
C.PSU
D.PIU
参考答案:C
用计分卡强化()
A.系统脱敏法
B.厌恶疗法
C.行为塑造法
D.代币制疗法
E.暴露疗法
Her sister suggested to the Great Wall. [ ]
A. go
B. going
C. to go
D. went