以下选项中属于空间数据编辑与处理过程的是:()。
A.图幅拼接
B.投影转换
C.数据格式转换
D.数据分发
参考答案:A, B, C
用所给词的适当形式填空。
1. What time _____ (be)it?
2. He _____ (not have) rice for breakfast.
3. My mother often _____ (do) housework in the evening.
4. _____your friend _____ (do) homework in the evening?
5. What time_____she_____ (get) to work every day?
人耳能产生声音感觉的振动频率范围是()。
A.220~~22000HZ
B.30~~30000HZ
C.330~~33000HZ
D.20~~20000HZ