When this tensor vanishes, the space is calleda flat.当这一张量为零时,空间叫做平直空间.If the circulation vanishes at one instant of time, it must vanish for all times.只要环量在某一瞬间为零, 它就必须永远为零.With this said, the old man vanishes out of si...
Rectifier units with a capacity of 20 to 25 amperes for each charging circuit are acceptable.每条充电线路可容纳容量为20―25安培的整流装置.The current from these parallel generators will add up to make a total flow of 500 amperes.这些并联的发电机所产生...
"And now, without further ado, let me introduce our benefactor."“下面，闲话少说，让我来介绍一下我们的赞助人。”We collected ￡478 , but a very generous benefactor made it up to ￡500.我们募捐了478英镑, 一位非常慷慨的捐款人凑足到500英镑." Mr. Li is not only the school...
去年, 二甘醇在巴拿马被错误地同止咳糖浆混在了一起.Last year, diethylene glycol was mistakenly mixed with cough syrup in Panama.采用二甘醇作为加合物的分解剂,得到了二元酸.Diacid has been got using diethylene glycol as decomposition agent of adduct.分析了TiO2对二甘醇生成的影响.E...
Hardship and penury wore him out before his time.受穷受苦使他未老先衰.He was brought up in penury, without education.他从小一贫如洗，没有受过教育。A succession of bad harvests had reduced the small farmers to penury.连年歉收使小农陷入了一贫如洗的困境.A successio...