控制截断伪影的措施不包括（）
A.缩小采集矩阵
B.减小FOV
C.过滤原始资料
D.变换相位和频率编码方向
E.改变图像重建的方法
参考答案：A
Paul Ostrowski, CFA, is a well-known economist working of local government and does research about unemployment. Which of the following types of unemployment are included in the natural unemployment rate（）
A. Structural and cyclical.
B. Cyclical and frictional.
C. Frictional and structural.
向级别与本机关相同的有关主管部门请求批准某事项应使用( )。
A．请示B．报告C．通报D．函
