单萜类化合物是植物挥发油的主要成份.The monoterpenoids are dominant components in the " volatile oils " of plant species.目的: 研究腺点金丝桃挥发油成分及相对含量.AIM : To study the constituents of Hypericum Scabraum. its percentage composition.方法: 采用水蒸气蒸馏法从...
我们沿着桥上狭窄的钢制格架往前爬。We were crawling along the narrow steel lattice of the bridge.通常白云石晶体构成格架,它有均匀分布的孔隙.Commonly the dolomite crytals form a framework with evenly distributed porosity.颗粒本身远比颗粒格架坚硬.The individual grains are ...