不论是数字的还是模拟的通信系统，只要进行相干解调都需要（）
A、载波同步
B、网同步
C、位同步
D、群同步
参考答案：A
I support your decision, but I should also make it clear that I am not going to be to carry it out.
A．connected
B．fastened
C．bound
D．stuck
现代化生产工业有哪几方面的特点？
