第6题: [单项选择]Questions 22 to 25 are based on the conversation you have just heard. A. They both have leg injuries. B. They’re too tired to walk any farther. C. They have no umbrella with them. D. They’ve seen no signs to give them directions. 参考答案:C 答案解析:[听力原文] What problem do the speakers have at this time
第16题: [单项选择]与CT受检者的辐射剂量无关的是() A. 螺距 B. 管电流 C. 管电压 D. 机房屏蔽 E. 层厚 参考答案:D 答案解析:在单层螺旋CT扫描中,床运行方向(Z轴)扫描的覆盖率或图像的纵向分辨力与螺距有关。在单层螺旋扫描螺距等于1时,只产生一幅图像(不考虑回顾性重建设置因素),而多层螺旋扫描螺距等于1时,根据不同的CT机,