横向弛豫时间是指横向磁化由最大减少到最大值的（）。
A.100％
B.83％
C.63％
D.50％
E.37％
参考答案：E
按每小题后的要求转换下面的句子；每空一词。
1. The 3D film Titanic is fantastic. (对划线部分提问)
the 3D film Titanic?
2. Because of Sandy, I got the well-paid job. (改为同义句)
Sandy, I got the well-paid job.
3. Tony said,"I am singing when the telephone rings."(将直接引语改为间接引语)
Tony said that singing when the telephone rang.
4. We decided that we should stay for a cup of tea. (改为同义句)
We decided for a cup of tea.
5. She dressed like a man. She could join the army. (合并为含状语从句的句子)
She dressed like a man she could join the army.
放大摄影能将细小结构显示清楚，其原因是
A．空气滤过散射少B．照射野小清楚度高C．将高频信号转换成低频信号D．焦点面积变小 E．模糊阈值变大
