This article is the knob-style keyboard realization.
本文介绍的是旋钮式键盘的实现方法。
Currently in use the keyboard there are two categories: push-button keyboard and knob-style keyboard.
目前使用的键盘主要有两类:按键式键盘和旋钮式键盘。
The width of count time and display style can be set respectively by keyboard .
计数器的计数时间宽度和显示方式由键盘设定。
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