人机界面是人与机器( )的环节,如果设计不当,人与机器相接触造成能量逸出,将直接导致事故发生。
A.交换能量
B.协调关系
C.相互适应
D.交换信息
参考答案:D
— Have you known Dr Jackson for a long time?
— Yes, since she _____ the Chinese Society. [ ]
A. has joined
B. joins
C. had joined
D. joined
下列选项中不属于板书特点的是()。
A.趣味性
B.丰富性
C.直观性
D.启发性