时域压缩（或称为波形编码）技术
参考答案：
是直接针对音频PCM码流的样值进行处理，通过静音检测、非线性量化、差分等手段对码流进行压缩。
You have to be accurate in this job, because a small mistake can make a big ________. [ ]
A. difference
B. difficulty
C. trouble
D. change
A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ________ many factors lead to the change.
A．which
B．what
C．where
D．that
