题目

阅读理解In the book I've been reading lately, “On Living” by Kerry Egan, she shares so many powerful stories ? each story a parting gift from a hospice (救济院) patient who never knew when a newly arriving might be their last.What a profound (深刻的) way to live! In a sense, I guess we all live that way, each and every day. But as I read this book, I get the feeling that only hospice patients really know this. Sometimes I realize it, like when I am faced with a choice to work more to earn more money or to go to spend the day with a loved one and earn no money. On the one hand, mo有一种干粉灭火器利用压缩的二氧化碳吹出干粉（主要成分是磷酸二氢铵），根据如图回答下列问题。（1）图中所标物质中属于合成材料的是_____ （写一种）。（2）干粉灭火器灭火的原理是_____。（3）在钢瓶的表面涂油漆的作用是_____；废铁除铁锈后再利用，工业用盐酸除铁锈的化学方程式是_____。（4）灭火器中磷酸二氢铵（NH4H2PO4）可作_____（填字母）来使用。A 氮肥 B 磷肥 C 钾肥 D 复合肥（5）对废旧金属回收利用的目的是_____。