Commonly the dolomite crytals form a framework with evenly distributed porosity.通常白云石晶体构成格架,它有均匀分布的孔隙.Locally dolomite and anhydrite are important as cements , together with minor authigenic quartz.在局部地方白云石和硬石膏也是重要的胶结物;还...
Commonly the dolomite crytals form a framework with evenly distributed porosity.通常白云石晶体构成格架,它有均匀分布的孔隙.Locally dolomite and anhydrite are important as cements.局部地方白云石和硬石膏也是重要的胶结物.Many carbonate masses older than Middle Pa...
The Frequency Shift Keying modulation is widely used in HF digital communication.移频键控是短波数字通信中常用的一种调制方式.Her sister carried with her most of the grimness of shift and toil.她姐姐身上还带着艰辛操劳的痕迹.Before deselecting shift the selec...