Oil - yielding organic matter is contained in the shales.在这些页岩里有产油的有机物质.Thus clays and shales tend to be impermeable.因此粘土和页岩就往往不透水.Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.Alternating sandstones and...
DNA交链主要由照射于DNA或细菌芽胞引起.DNA cross - links are produced mainly upon irradiation of dry DNA or bacterial spores.目的: 探讨互隔交链孢霉诱导 食管癌 的发生机制.Aim : To study the mechanism of esophageal cancer induced by alternaria ( AOH ).硼砂是一种交链...
一条内河船从桥下经过。A river boat passed under the bridge.货物已载入一艘内河轮船上.The cargo has been transshipped into a river steamer.内河航道两岸的事物变得更加生机勃勃.Things would get more lively along the river courses....