问题
单项选择题 A型题
要求图像的近、中、远声场都能达到最清晰的显示，此称为（）。
A.空间分辨力
B.时间分辨力
C.对比分辨力
D.图像的均匀性
E.最大穿透力
答案
参考答案：D
解析：相同的组织应以相同亮度的图像显示。但是，由于超声波在组织传播过程中不断衰减，远区衰减大，回声弱于近区，故可以使用时间增益补偿，以求得图像的均匀性。
搜题请搜索小程序“爱下问搜题”
要求图像的近、中、远声场都能达到最清晰的显示，此称为（）。
A.空间分辨力
B.时间分辨力
C.对比分辨力
D.图像的均匀性
E.最大穿透力
参考答案：D
解析：相同的组织应以相同亮度的图像显示。但是，由于超声波在组织传播过程中不断衰减，远区衰减大，回声弱于近区，故可以使用时间增益补偿，以求得图像的均匀性。
The Sea Life Centre is a Really Exciting Place Good morning, everyone. 36 to the new Sea Life Centre at Plymouth. The Sea Life Centre is a really exciting place. There are so many things to 37 here and everything is enjoyable. It costs $3.76 for adults , $2 for children and 38 for over sixties and school groups. It’s 39 from 9:00am to 4:30pm every day except 25th and 26th of December. Special 40 include hourly feeding times for all the different animals and fish, and shows in the sea life theatre. 41 is always there to answer questions about what you’ve seen. 42 you are in a group of six or more people, we 43 give you a special guided tour of the centre. But you 44. to arrange(安排 ) this at the information desk when you 45 . The latest attraction(吸引人的事) is a big 46 tunnel(隧道 )you can walk through. All around you, you will see fish swimming--- sometimes even over your head. You certainly have the 47 view(景色 ) of the undersea world. Children 48 it and it’s really amazing for adults, too. When you get 49 , there is a relaxed family dining room serving food. That’s all. For 50. information, phone 091743-564219. Have a good time! Thank you.
|