Natural gas liquification involves both mixed - refrigerant cycle and nitrogen expander cycle.近几年国内天然气液化技术主要采用混合工质液化循环和氮膨胀液化循环.The Catalyst that is suitable for Shenhua coal liquification was found out through experiment...
Kelp is rich in vitamins and trace elements.大型褐藻富含维他命和微量元素.On the beach giant kelp had washed ashore.沙滩上有随浪冲上来的大海藻.A gelatin - like substance obtained from kelp and used in impression material.一种从海藻中获得的类似凝胶的物质并且用于印模原料....