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鱼类的皮肤就是起保护作用。()

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有尾目的主要特征:

越冬洄游(名词解释)

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a

A. it has a longer power stroke
B. more air gets into the cylinder each stroke
C. it develops twice as many power strokes at the same speed
D. higher combustion pressure is developed

下列贫血中可以通过骨髓涂片断的是

A. 巨幼细胞贫血
B. 缺铁性贫血
C. 再生障碍性贫血
D. 血红蛋白病
E. 自身免疫性溶血性贫血

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