如果让你用贝壳做水泥,你的思路是什么?或许你会这样想:贝壳的主要成分是碳酸钙(CaCO3),水泥的主要成分是氧化钙(CaO),贝壳经过高温处理(煅烧)后产生的氧化钙(CaO)正是水泥的关键成分之一。的确是这样,思路正确!
“Looking at the Dongting landscape from a distance, there are green snails on the silver plate.” “Where Yangtze River diverges, waters of Dongting Lake lie, expanding their vibrations to the ...