数字信号在传输中产生码间串扰的主要原因是（）。
参考答案：传输特性不良、加性噪声的影响
Amy would rather in Sunshine Town than in Moonlight Town.
A．shopping, go shopping
B．shop ,go shopping
C．to shop, to shopping
D．shop, to go shopping
立克次氏体是一类只能寄生于真核细胞内的G-原核生物。（）
