人工控制是提高人的眼、脑、手来实现的，工作单调、劳动强度小。( )
参考答案：错
— Mum!Alice has broken my CD player!
— ________After all, she couldn't have done it on purpose. [ ]
A. What's the matter?
B. It doesn't matter.
C. No trouble at all.
D. How come?
逻辑函数，其“与非与非”表达式为（）
A.A
B.B
C.C
D.D
，其“与非与非”表达式为（）