评价铁矿石质量应从哪些方面进行？
Why did the Civil War break out? How did the war end?
组织设计的权变理论包括哪些内容（） ["组织须适应于工作任务","组织须适应于技术工艺特征","组织须适应于外部环境","组织须适应于内部环境","组织须适应于员工"]
Reasons for the British coal mining is called a “sick” industry today.
商品重要的化学性能有（） ["脆性","耐光性","硬度","弹性"]
电站锅炉燃料为什么要以煤为主？为什么要提倡以煤代油？
