20世纪40年代熟悉手动打字机的打字员和20世纪60年代使用电动打字机的秘书相比，两者各自认为重要的键盘特性是不同的。
The attributes that were important to a typist familiar with the manual typewriters of 1940s are different from what's important to a secretary who used a Selectric in the 1960s.
通过一个设计实例，在全电动注塑机的人机界面中实现了注塑机工艺执行按键和标准双重输入键盘。
Through a design example, this paper realizes a double the implementation of key and standard keyboard in the human-computer interface of all-electric injection molding machines.
该装置由水滴速度测试系统、滴速控制系统、显示装置、单片机系统、键盘和报警等系统组成。光电传感器用来测量液体滴速，利用步进电动机的转速来控制点滴速度，显示装置利用液晶显示器。
The apparatus constitutes the system of testing the liquid drop speed, the system of controlling the liquid dropping speed, LCD display system, MCS-51 system, the key board and alarming system.
该装置由水滴速度测试系统、滴速控制系统、显示装置、单片机系统、键盘和报警等系统组成。光电传感器用来测量液体滴速，利用步进电动机的转速来控制点滴速度，显示装置利用液晶显示器。
The apparatus constitutes the system of testing the liquid drop speed, the system of controlling the liquid dropping speed, LCD display system, MCS-51 system, the key board and alarming system.
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