问题描述： 由……组成 英语怎么说 （2种说法） 1个回答 分类：英语 2014-11-06 问题解答： 我来补答 make up ofeg.We think of a nucleus as make up of neutron and proton.be composed ofeg.Concrete is composed of cement,sand and gravel mixed with water. 展开全文阅读
