硅酸的工业制法是：将稀释好的硅酸钠和硫酸反应生成水凝胶，经水洗与干燥得到成品．有关反应的化学方程式是_．

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• 硅酸的工业制法是：将稀释好的硅酸钠和硫酸反应生成水凝胶，经水洗与干燥得到成品．有关反应的化学方程式是_．
• 硅酸的工业制法是：将稀释好的硅酸钠和硫酸反应生成水凝胶，经水洗与干燥得到成品．有关反应的化学方程式是______．
• 硅酸的工业制法是：将稀释好的硅酸钠和硫酸反应生成水凝胶，经水洗与干燥得到成品．有关反应的化学方程式是______．
• they pull that building down to save lives. 翻译问题请教"They see any building that's getting old and has a crack on that building they pull that building down to save lives.此句,句子结构是什么,怎么拆分,怎么翻译?
• 英语翻译Several social workers printed a "wanted" poster with color pictures of the police officers they said were responsible for the beating,and were carrying it up and down the line of those waiting to file complaints.up和down修饰的前面carry还是the line of？