The police hope to avoid a repeat (perform) ____________ of last year, when the festivities (庆典) turned into rioting (骚乱).
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We could take on extra staff ----that's one (possible) ____________.
To everyone's surprise, his (predict) ____________ of the severe storm came true.
If you tell him what happened, I'm sure he'll understand----he's a (reason) ___________ man.
χ为很大的正数,在较弱磁场作用下可以产生很大的磁化强度,这种物质是()
A. 抗磁体
B. 顺磁体
C. 铁磁体
D. 反铁磁体