第7题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard. A. They are expensive. B. Their quality is not good. C. They are cheap. D. They are uncomfortable. 参考答案:A 答案解析:[听力原文] What does her father think about Adidas shoes
第20题: [单项选择]CT图像中一段从白到黑的灰度影像,称为() A. 密度分辨率 B. 空间分辨率 C. 灰阶 D. 窗宽窗位 E. 噪声 参考答案:C 答案解析:在照片或显示器上所呈现的黑白图像上的各点表现出不同深度灰色。把白色与黑色之间分成若干级,称为"灰度等级",表现的亮度(或灰度)信号的等级差别为灰阶。