Make a comparison with two kinds of numeric keyboard layouts used for calculators and phone set,based upon a test,and explain their difference in terms of ergonomics.

• 通过实验的方法,分别采取计算器和电话机数字键盘的排列方式,对输入数字正确率和速率进行了比较,并对两者的差别用人机工程的方法作了说明。