计算两个N1点和N2点序列的线性卷积，其中N1>N2，至少要做（）点的DFT。
A.N1
B.N1+N2-1
C.N1+N2+1
D.N2
参考答案：B
The decision has been made________a new school building be built next month.[ ]
A. why
B. if
C. whether
D. that
下列正确的说法是
A．气病察舌苔
B．血病察舌质
C．舌质察六腑
D．舌苔重在辨邪气
