创建一个抽象基类Emp，派生类是Boss(固定工资)，Sales(基本工资加提成)，PieceWorker(计件工)(按件计工资)。通过该程序计算所有员工的工资，所以从Emp派生出来的每个类都有Ear方法。
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他的著作较多，其中最著名的是1895年发表的《计件工资》（Piecework）和1903年发表的《车间管理》（ShopManagement），以及1912年发表的《科学管理原理》。
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piecework wage 计件工资 ; 计件工资来源考试大
Straight piecework 直接计件制 ; 计件制
Guaranteed piecework plan 有保障的计件工资制
piecework system [劳经] 计件工资制 ; 计件制
nonrestrictive piecework wage [劳经] 无限额计件工资
per piecework rate 计件工资率
piecework job [经管] 计件工作
N-UNCOUNT If you do piecework, you are paid according to the amount of work that you do rather than the length of time that you work. 计件工作
The tobacco workers were paid on a piecework basis.
烟草工人是计件给钱的。
The tobacco workers were paid on a piecework basis.
烟草工人是计件给钱的。
Production was generally in the hands of skilled individual artisans doing piecework under the tutelage of a master who was also the shop owner.
生产工作一般在师傅也是店主的监视下，由熟练的工匠计件而成。
I get paid for piecework, not on a monthly wage.
我拿的是计件工资，不是月工资。
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