抽象行政行为的特征包括：
A．对象的特定性
B．效力的普遍性
C．不可诉性
D．准立法性
参考答案：B,C,D
An analyst gathered the following information about a perpetual preferred stock and a common stock issued by the same company
The values of a share of the company’s preferred stock and common stock, respectively are closest to Value of preferred stock Value of common stock()
A. $ 58 $ 29
B. $ 58 $ 32
C. $ 85 $ 29
话音记录器自检启动后,若在控制面板上的耳机插孔内听不到800HZ音频,说明:（）
A、正常
B、系统有故障
