题目

有关氧气的说法中不正确的是（      ） A．工业上可利用分离液态法制氧气 B．液氧用于火箭发射是利用氧气的可燃性 C．实验室可用加热高锰酸钾的方法制取氧气 D．氧气可用于潜水 答案：B Many of his classmates came to his birthday party; it was a great success to him.A.at all B.in allC.above all D.all in all