Energy is defined as the ability to do work.
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We can easily see from the definition of k _______ the ratio of a force _______ a length that the unit of elastic potential energy （）
We can easily see from the definition of k _______ the ratio of a force _______ a length that the unit of elastic potential energy （）
A.by……with
B.by……to
C.as……with
D.as……to