The extraction mechanism of palladium in chloride system by di ( 1 - methyl heptyl ) acetamide ( N _ ( 503 )) has been studied.本文研究了N, N二 甲庚基乙酰胺 ( N_ ( s03 ) )从氯化物体系中萃取钯的机理....
The days draw in and the mornings get darker.天黑得越来越早,天亮得越来越晚。Norway had held Holland to a scoreless draw in Rotterdam.挪威队在鹿特丹以零比零逼平荷兰队。The days begin to draw in after the summer solstice.夏至之后白天开始变短....