专家系统的弱点有（）
A.知识获取困难
B.操作复杂
C.适应能力差
D.自学习能力差
参考答案：A
______ to somebody, a British person often shakes hands with the stranger.
A．Introducing
B．To introduce
C．To be introduced
D．On being introduced
仁爱孝悌
