The mass fraction of n - butene in mixed C 4 from catalytic cracking after etherized was approximately 40 %.醚化后的催化裂化混合C4中含有质量分数约为40%的正丁烯,是生产丙烯的优质原料....
It is possible to follow the complete buildup of oscillation.了解振荡建立的整个过程是可能的.The buildup of impurities often results in defective plating.杂质的积累经常导致不良的电镀.We get a buildup of electronic probability density between the nucl...
He has on a denim shirt with a T-shirt underneath.他穿了一件牛仔衬衫,里面套了件T恤.Jeans, the all-purpose denim trousers, have been around for over a hundred years.牛仔裤，这种适合各种用途的斜纹粗棉布裤子，已经有一百多年历史了。Dennis was dressed in denim jeans.丹尼斯穿了...