单项选择题

一般来说，褶皱的核部是裂隙水富集的地方。
A、正确
B、错误

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单项选择题

The crack tends to grow into the more brittle material and then stay in there, whether the initial crack tip lies in the graded material or in the more ductile material (and thereafter advances across the graded layer.

A．whether
B．tends
C．thereafter
D． lies in

多项选择题

WAVE文件头中包含（）信息

A．“RIFF”标志
B．通道数
C．采样率
D．量化bit