区域经济发展理论来自于实践,又应用、指导实践,它对制定合理的区域经济发展战略具有重大作用.不同的地区经济适用的发展模式和相关产业的选择并不一样,在选择区域经济发展模
以石油生焦为原料，硫酸和硝酸的混合酸为氧化剂，通过化学氧化制得炭质水性中间相。将炭质水性中间相于丙酮溶剂中浸泡7 d形成炭质溶胶，然后用乙醇洗涤脱出其中的丙酮溶剂得到炭
Interspecific hybridization can result in significant shifts in allele frequencies. The objective of the present study was to assess the level of genetic variat
近些年来,全球的科学技术迅猛发展,新理论,新技术,新产品日新月异,层出不穷.科学技术的发展推动了全球经济的繁荣,以科学技术为主要特征的知识经济把人们的价值观提到了一个
Seed shattering is a common problem in early soybean production system (ESPS) in the Midsouth, which mainly uses maturity group (MG) IV soybeans. Many studies h
Nature’s first greer is gold,Her hardest hue to hold.Her early leaf’s a flower;But only so an hour.The leaf subsides to leaf,So Eden sank to grief,So dawn goe