英文介绍化学元素铅
问题描述：
英文介绍化学元素铅
包括铅的发现,什么是铅
有什么用处,性质等等.要英文的..
答
性质Lead is bright and silvery when freshly cut but the surface rapidly tarnishes in air to produce the more commonly observed dull luster normally associated with lead. It is a dense, ductile, very s...