题目内容

3S集成是指( ) 、( )、( )三者的集成利用。其中()主要用于数据更新。

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属性数据编码即确定属性数据代码的方法和过程,其主要编码方法有层次分类编码法、( )等。

It's not easy to keep your room every day.

A. clean
B. cleanly
C. being cleaned
D. cleaning

The boy sat there all afternoon, at the passers-by.

A. and staring
B. who stared
C. staring
D. stared

.you change your mind, please contact us immediately.

A. Were
B. Had
C. Might
D. Should