数字波形音频的保真度主要取决于什么因素？
参考答案：保真度（即采样的音频质量）取决于采样频率、采样精度和声道数。
十二烷基磺酸钠在明胶空心胶囊中作（）
A.增塑剂
B.增稠剂
C.增光剂
D.遮光剂
E.防腐剂
— My father's just back from work, ?
— . He is having a rest in the room. [ ]
A. hasn't he; Yes, he has.
B. has he; No, he hasn't.
C. isn't he; Yes, he is.
D. Is he; No, he isn't.
