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【单选题】
若 x(n) 为实序列, X(e jω ) 是其傅立叶变换,则( )A.
X(e jω ) 的幅度和幅角都是 ω 的偶函数
B.
X(e j ω ) 的幅度是ω的奇函数，幅角是ω的偶函数
C.
X(e j ω ) 的幅度是ω的偶函数，幅角是ω的奇函数
D.
X(e j ω ) 的幅度和幅角都是ω的奇函数
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