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培训师的作用有哪些？

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简述培训需求的任务分析的一般步骤。

汉与匈奴的战争中,存在一定的季节规律,分别是()和()。
A秋冬匈奴南下
B春夏汉军北上
C春夏匈奴南下
D秋冬汉军北上

He said that the passenger _______ an accident; otherwise he would have arrived by that time

A. must have
B. must have had
C. would have had
D. should have had

“平城之围”中,被围困的是()。
A刘邦
B韩信
C张良
D卢绾