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Multipleselectionproblem(singleoption)Whichofthefollowingexpressioncanbeusedtoexpressthermsandthephaseofasinusoidatthesametime?

题型：单选题

选项

A. A.a real number

B. B.a complex number

C. C.an imaginary number

D. D.a rational number

正确答案：B