标题: 一题请教 [打印本页] 作者: ninaluan 时间: 2003-7-3 15:17 标题: 一题请教 because natural gas is compposed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit (less of certain polutants than the burning of gasoline or diesel fuel)
E. less of certain pollutants than those burning tgasoline or diesel fule. 请问为什么一定要有THOSE呢？作者: joywzy 时间: 2003-7-3 15:44
这题比较的是vehicles.