南美洲和北美洲由一条运河连在一起.South America is joined to North America by a canal.南美洲和北美洲相连.South America is jointed to North America.这里采用的符号和表示方法实际上是北美洲通用的.The symbols and notation used herein are essentially those in current use in...
Tungsten is classified among the metals.钨归入金属类.A glass or quartz tube has tungsten electrodes sealed in each end.两根钨丝电极是封在玻璃管或石英管的两端.The tungsten shines and gives a good light.钨丝发亮而射出耀眼的光芒....
Lubrication reduces noise and wear.润滑作用能减少噪音和磨损.We shall require more lubrication oil this month.这个月我们需要更多润滑油.Sludge can also clog oil passages and prevent normal engine lubrication.油泥还会阻塞油路,妨碍发动机的正常润滑工作....
Cu furaldehyde - diamine Schiff base complex was synthesized with the yield of 63.合成了一种席夫碱金属络合物——呋喃甲醛乙二胺铜络合物,收率为63.HEDTA ( N - hydroxyethyl ethylene diamine triacetic acid )N - 羟乙基乙二胺三醋酸 ( 有机螯合剂 )Dialysis and ethylene di...
Its distribution pattern was aggregative and the stand structure had distinct levels.分布格局呈群聚型,林分结构层次分明.In the course of its development, an integrative aggregative tension appeared.在教育政治学发展的过程中, 出现了两种张力:整合的张力和多元的张力.Sino ...