legs.
This work has attracted the attention of efficiency experts and time-and-motion-study engineer, but its value goes far beyond that. Dr. Tichauers first thought is for the health of the tool user. With the repeated use of the same tool all day long on production lines and in other jobs, even light manual work can put a heavy stress on one small area of the body. In time, such stress can cause a disabling disease. Furthermore, muscle fatigue is a serious safety hazard.
Efficiency is the by-product of comfort, Dr. Tichauer believes, and his new designs for traditional tools have proved his point.
听力
21. What are involved in the design of a new tool according to the passage?
A) Electronic instruments and a regular tool.
B) A human guinea pig and a regular tool.
C) Electronic instruments and a human guinea pig.
D) Electronic instruments, a human guinea pig and a regular tool.
22. From the passage we know that joints and muscles perform best when __________________.
A) they are twisted and stretched
B) they are in their normal positions
C) they are tested with a human guinea pig
D) they are tested with electronic instruments
23. A myograph is an electronic instrument that ________________.
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