从下寒武统石龙洞组开始都是白云岩沈积.Dolostone is the main rock type of the Cambrian in this area.白云岩是冶炼金属镁的主要原料.Bai Yunyan is the main raw material of smelt metal magnesium.晶粒白云岩有两种成因:一为回流渗透白云石化;二为深埋藏白云石化.Crystalline dolostone is formed ...
The memory expansion cards are useful adjuncts to the computer.内存扩充卡是计算机很有用的附件。the expansion and contraction of the metal金属的膨胀与收缩a period of rapid economic expansion经济迅猛发展期...
PbZnTi - PILC catalyst is prepared by introducing Pb and Zn into Ti - PILC; DPC yield is 10.1 %.用把活性组分引入Ti -PILC 的方法制备了TiPbZn-PILC催化剂,其DPC产率为10.1%.Mouse Embryonic Fibroblast were obtained from mouse embryo 13.5 dpc or 14...