四川白鹅、狮头鹅、豁眼鹅、伊犁鹅、朗德鹅和莱茵鹅是具有独特种质特性的家鹅品种。该试验利用直接测序法测定了具有独特种质特性,在鹅杂交育种中被广泛应用的四川白鹅等6个
The mechanical properties of pressureless sintering Fe-Si3N4 bonded SiC and Si3 N4 bonded SiC with same manufacture process have been compared in this paper.The
在基坑运行过程中,基坑坑顶往往出现位移偏大,顶部出现裂缝,甚至出现险情。在出现这种情况时,处理最为有效的办法是:坑顶卸土、坑底反压。坑顶卸土对基坑的稳定非常直观,卸土范围大
为掌握光皮树在赣北地区的物候期和生长量,对光皮树的播种育苗时间、种子处理方法、整地方式和土壤处理方法进行了研究,结果表明:赣北地区光皮树萌动期在3月中、下旬;展叶期在
Using magnesia and hercynite as materials, we researched the magnesia-hercynite brick in order to solve the problem of chrome-free brick used in the burning zon
<正>GB/T 2275-20011 ScopeThis standard specifies the classification, techni-cal requirements, test method, quality examinationregulation, packing, label,