一载波为10MHz的宽带FM信号，调频指数为20，当调制信号频率为2KHz时，信号带宽为（）。
参考答案：84KHz
消化道出血最常见的病因是
A．消化性溃疡
B．肝硬化门静脉高压
C．胃结石
D．胆道出血
E．慢性胃炎
The main feature of (72) is that they follow a first-come/first-served rule. For instance, the line of (73) waiting to be run on a computer system.
A．works
B．jobs
C．tasks
D．assignments
