— He is eager to try something he has never tried before.

— Oh, I see. That's ____ he's different from others.[ ]

A. when

B. where

C. how

D. what

下述哪一种方法不属于并行数据库物理存储中常用的关系划分方法？

A．轮转法

B．投影法

C．散列分布

D．范围分布