问题
单项选择题
自然组织谐波的作用是
A.增加可视帧频
B.增加界面分辨力,清晰度及信噪比
C.增加高频超声的穿透深度
D.提高声输出功率
E.减少超声能量的衰减
答案
参考答案:B
自然组织谐波的作用是
A.增加可视帧频
B.增加界面分辨力,清晰度及信噪比
C.增加高频超声的穿透深度
D.提高声输出功率
E.减少超声能量的衰减
参考答案:B
(1)从B栏中找出与A栏相对应的答语。(5分) A B
2. What day is it today? 3. Could you please do me a favor? 4. How well you dance! 5. We won the basketball match. (2)从框里选择填入对话相应空白处的适当选项(10分)
B. Yes, please. A. How do you feel now? B. 2 . A. What are you going to do before leaving school? B. I’m going to take some photos with my teachers and classmates, give gifts to my teachers and write best wishes to my classmates A. Will you miss your teachers and classmates? B. Sure, and I’ll remember the past three years of my school life for ever. A. 3 B. By sending e-mails, making telephone calls or writing letters. A. When are you going to have a get-together with your classmates? B. We’ll be back for our school’s 20th anniversary ceremony. A. 4 B. I’m going to be a scientist, so I’ll keep on working hard at my lessons to make my dream come true. A. 5 . B. First, I want to say “Thanks” to my teachers for teaching me so well. Second, I wish my teachers and classmates health, happiness and good luck. At last, I hope our school will continue to be the top in Tongren. |