与CR相比DR的优势是()。
A.数字图像
B.激光打印
C.网络传输
D.图像后处理
E.直接数字成像
参考答案:E
用动词be 的适当形式填空
1.-______ you at home last week?-Yes, I ________.
2.-______ they away yesterday?-No, they ______.
3.-______ Bill ill the day before yesterday?-Yes, he _______.
4.-Who ______ on duty last Friday, Lucy or Lily?-Lucy ______.
5.-How ______ your last summer vacation?-It ______ great.
简述心理唤醒概念的强度—方向模型?