If k = -1, which of the following is (are) true?
I. kk = k
II. ~$\left | k \right |=-k$~
III. k0 = -k
I only
I and II only
I and III only
II and III only
I, II, and III
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负数的负次方为该负数的正次方的倒数。
负数的负次方为该负数的正次方的倒数。