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Olympiad-Science
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Class 5
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A heavy object could be rolled up this simple machine, instead of lifting it straight up. Using this simple machine can save effort, although the object must usually cover more distance if this simple machine is used. What is this machine?
$\begin{array}{1 1} (a)\;lever \\ (b)\; pulley \\ (c)\; inclined \;plane \\ (d)\; screw \end{array}$
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