The number of intersections of the graph of function y = f (x) and x = 2 () A. 0 B. 1 C. 0 or 1 D. not sure

The number of intersections of the graph of function y = f (x) and x = 2 () A. 0 B. 1 C. 0 or 1 D. not sure

∵ function is a mapping from nonempty number set a to nonempty number set B, so an x value in the domain of definition can only correspond to one y value. There is at most one intersection point between the image of ∵ function y = f (x) and a straight line x = 2, so C