地籍管理信息系统的非空间数据主要是以()等形式存在。
A.图片
B.各种文档
C.音调
D.报表
E.多媒体
参考答案:B, D, E
Tom, turn down the music. Why ____ you make such a big noise while your baby sister is sleeping? [ ]
A. could
B. would
C. should
D. must
纵向倾斜船台的斜率是指(),由于角度较小,有时可用()代替。