He said he would ________me to Professor McRae as his postgraduate student.
在一定温度下,4L密闭容器内某一反应中气体M,气体N的物质的量随时间变化的曲线如图所示:
某炼铁厂用赤铁矿(除含氧化铁外,其余成分不溶于水也不与酸反应)炼铁,欲测定赤铁矿中氧化铁的质量分数,请回答下列问题: