Research on Leverage Tools PPT-Textbook Science Six Courseware

The PPT of the "Study of Lever Tools" in the sixth edition of the science edition finds out the fulcrum, force point and resistance point of the iron piece, bottle opener and clip respectively. What is the difference between their three positions? Which of the three levers is labor-saving and labor-intensive? Compared with the leveraged tools above, which of the following leveraged tools is more similar to which?

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