问题
单项选择题
关于DSA的成像过程的叙述，错误的是（）
A.增强未造影图像和造影图像的X线信号
B.高分辨率的摄像机对增强的图像扫描
C.模拟信息经A／D转换成数字信息
D.造影图像的信息与未造影图像信息相减
E.血管像被减去，显示骨骼与软组织影像
答案
参考答案：E
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关于DSA的成像过程的叙述，错误的是（）
A.增强未造影图像和造影图像的X线信号
B.高分辨率的摄像机对增强的图像扫描
C.模拟信息经A／D转换成数字信息
D.造影图像的信息与未造影图像信息相减
E.血管像被减去，显示骨骼与软组织影像
参考答案：E
Three small fish lived in the sea. When they were very young, their parents died. They had to each other day after day. Finally, they grew up and to swim deeper and further. One morning. the three fish were to a shallow (浅) water by a big wave (浪). A small boat was taken there. too. It was hard for the fish to go back to the sea because the boat was right in front of them. The largest fish realized that they were and said they had to find a way to leave there as fast as possible. The second largest fish with his elder brother, but the youngest one did not. He said that there was much for their activities, so he would not worry at all and still swam around .At last, the largest fish returned to the by jumping over the lowest part of the boat. The second largest fish also succeeded in his eider brother in the other side of water. But the youngest one didn't follow them and still swam joyfully. Two hours later, when the rose up, the water in the small shallow corner dried up. The fish who did not try to return to the sea died of lack(缺乏)of water.
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