A. 该信号是奇函数且在一个周期的平均值为零，所以傅立叶系数a0和b。是零
B. 该信号是偶函数且在一个周期的平均值不为零，所以傅立叶系数a和a。不是零
C. 该信号是奇函数且在一个周期的平均值不为零，所以傅立叶系数a和b。不是零
D. 该信号是偶函数且在一个周期的平均值为零，所以傅立叶系数a和b。是零
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