空气的CT值()
A.0~20HU
B.30~60HU
C.-60~-90HU
D.1000HU
E.-1000HU
参考答案:E
下列哪些内容是异常的含义
A. 程序的语法错
B. 程序在编译和运行中所发生的异常事件
C. 程序预先定义好的异常事件
D. 程序编译错误
Few of them came to the city, ?[ ]
A. don't they
B. do they
C. didn't they
D. did they