Solution: According to the definition of mapping, every element in A is required to have an image in B, that is, there is a unique corresponding element, but every element in B does not necessarily have an original image, that is, there can be redundant elements in B, and A in A can correspond to 0 or 1. Similarly, there are two kinds of B and C, so * * has two cubic powers, eight of which are A to 0 and B to 0. A to 1, b to 0, c to 0; A to 0, b to 1, c to 0; A to 0, b to 0, c to1; A stands for 1, b stands for 1, and c stands for 0; A stands for 1, b stands for 0 and c stands for1; A to 0, b to 1, c to1; List the A pair of 1, the B pair of 1 and the C pair of 1 in turn. Generally speaking, if there are m elements in set A and n elements in set B, then the mapping from A to B has the power of n. ..