The type of coal - forming is humic coal, vitrinite is a main variations of coal maceral.煤的成因类型以腐植煤为主, 镜质组为主要的显微煤岩组分.There are relationships between absorption and proximate analyses, maceral analyses and ultimate analys...
It helps them detach themselves from their problems and become more objective.这有助于他们从所面临的问题中跳出来，变得更客观一些。Alexis saw his father detach himself from the group and walk away down the hill by himself.亚历克西斯看到父亲离开那一群人，独自走下山去了。D...
The transmission of normal circular - arc gear is a typical Bertrand conjugation.考虑到平行轴的法向圆弧齿轮传动已臻成熟,论文重点研究了相交轴与交错轴条件下法向圆弧齿轮传动的基本方案.a verb with an irregular conjugation不规则动词Aromatic cytokinins metabolism is classified un...
Accidental inhalation of the powder can be harmful.意外的粉尘吸入可能有害。It was an accidental meeting.这完全是一次偶然的相会.Our meeting in New York was quite accidental.我们在纽约的会见完全是偶然的....