According to the passage, Frank Gilbreth discovered how workers could eliminate waste motion by

Câu hỏi :

According to the passage, Frank Gilbreth discovered how workers could eliminate waste motion by

A using special tools such as cameras and clocks   

B using stop watches

C applying scientific management principles         

D watching his children do their chores

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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