问题
单项选择题
二尖瓣血流频谱哪项不对（）
A.系收缩期正向血流频谱
B.呈双峰型
C.正常时E峰流速大于A峰
D.呈空心层流
E.在老年人中可表现为A峰>E峰
答案
参考答案：A
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二尖瓣血流频谱哪项不对（）
A.系收缩期正向血流频谱
B.呈双峰型
C.正常时E峰流速大于A峰
D.呈空心层流
E.在老年人中可表现为A峰>E峰
参考答案：A
Yesterday Princess Eva(夏娃公主)was happy. She went to a carnival. The weather was sunny, and the food was . There were Clowns and a band(魔杖). She had a good, there was a bad magician at the party. Princess Eva saw the magician and she laughed. The magician didn’t . He touched her mouth with a wand. He said, “From now on, you can’t talk. You can’t laugh. ”And Princess Eva make a sound. Princess Eva could feel, and hear, and see, and smell, and taste. But she couldn’t . She couldn’t laugh. A doctor came and looked at her fingers, her , her eyes, her nose, and her tongue. She wasn’t sick. But something was . Even a clown couldn’t make her laugh! But then one day, a nice man came to town. He had a band of . His dog, his cat, and his horse sang for the princess. They made loud noises. They sounded ! The Princess started to . “Look! I can laugh! I can talk!” she cried. It was a happy day.
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