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。
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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
Josh has transferred to the school for three months, but he is still not familiar the environment.
A. by
B. with
C. to
D. upon