Surface defect and macrostructure of high carbon steel billet were analyzed.介绍了铸坯相关表面缺陷及低倍组织,提出了质量控制措施及方案.Macroproposition: It is the general proposition used to form an overall macrostructure of the story.宏观命题: 它是用来形成故事...
呼吸充满了石棉的空气可能对健康有害.Breathing asbestos - laden air may be hazardous to health.接触石棉的工人需穿防护衣.Workers who handle asbestos need to wear protective clothing.海泡石是一种新型的可代替石棉的 非 石棉、非金属矿物纤维.Sepiolite is a kind of Non - asbestos non...
At high altitudes it is difficult to breathe.在海拔高的地方会感到呼吸困难.The air is rare at high altitudes.高处空气稀薄.Of special interest is the photographic determination of altitudes of lunar formation.最有趣的是用照相来测定月面结构物的高度....
The flow of air through the fan is substantially parallel to the impeller axis.通过风机的气流基本上是与叶轮轴平行的.Impeller are open, and closed three - Banbi, as shown in Figure 2 - 2 .叶轮有开式 、 半闭式和闭式三种, 如图 2-2 所示.Impeller has single - a...