维纳滤波器通常用于（）
A、去噪
B、减小图像动态范围
C、复原图像
D、平滑图像
参考答案：C
设备的设计压力＜0.1MPa时被称为（）设备。
A．低
B．中压
C．常压
D．高压
255. The college entrance examination is drawing near and all the students are ploughing through their studies. What does the underlined part means _____.
A．learning to plough
B．studying hard
C．ploughing the field
D．studying the plough
