砂岩通常都与页岩互层.Sandstones are, as a rule , interbedded with shales.最粗粒砂岩与灰色泥岩成互层.The coarsest sandstones intercalated with grey mudstones.砂岩储层与火山岩是互层分布, 其厚度呈负相关.Sandstone reservoir and volcanic rock distribute alternately, t...
The nature of the nutritional requirements for obligate parasites in nature is unknown.人们还不知道自然界中专性寄生菌的营养要求的本质.All the photosynthetic bacteria possess the capability in addition to various facultative aerobes and obligat...