题目内容

--You haven’t lost the ticket, have you ?--_____.I know it’s not easy to get another one at the moment .

A. I hope not
B. Yes, I have
C. I hope so
D. Yes, I’m afraid so

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--Now, where is my purse?--____! We’ll be late for the picnic.

A. Take your time
B. Don’t worry
Come on
D. Take it easy

--Peter was Jane’s brother!--_____he reminded me so much of Jane!

A. No doubt
B. Above all
C. No wonder
D. Of course

机械式按键在闭合和断开的过程中都存在抖动问题，去抖动方式有去抖和去抖。

矩阵式键盘的键值确定通常根据行号和列号采用公式：键值= 号˟总列数+ 号，行号和列号从0开始。