某板坯连铸机拉坯速度为2.0m/min,出结晶器的安全坯壳厚度为12mm,结晶器冷凝系数为20mm/min,求该铸机的结晶器长度
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通过记录大脑皮层的脑电活动的变化,发现在4-20岁之间,大脑有两个显着加速期。第一次发生在_______岁之间,第二次发生在_______之间
We have three important parts of education reading, writing and mathematics. Some people think every child will benefit from the fourth skill added to the list: computer skills. Do you agree or disagr
Today consumers are facing an increasing amount of advertising from competing companies. To what extent do you think consumers are influenced by advertisements? What measures can be taken to protect t
结合实际论述幼儿园应如何在管理工作中实施保教结合的原则