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毛泽东将郭沫若的哪篇文章当作延安整风的学习文件?

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Which space(s) on your cargo vessel must have a fire detection system?()

Any compartment containing explosives
B. Any compartment adjacent to one containing explosives
C. Enclosed spaces which are specially suitable for vehicles
D. All of the above

输血后感染乙型肝炎(乙肝),这是()

A. 医源性传播
B. 垂直传播
C. 空气传播
D. 接触传播
E. 食物传播

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《语文课程标准》为什么要积极倡导“合作”的学习方式?

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