锑的百分含量由各蓄电池生产厂自己掌握.The percentage of antimony may be left to the battery manufacturer.含锑的铅较化工铅好些,由于它有更好的抗蚀性及强度.Antimonial lead is preferable to chemical lead because of its greater corrosion resistance and strength.一种蓝灰色...
They are acrylaldehyde hydration, ethylene oxide formylation and biological zymolysis methods.即丙烯醛水合法, 环氧乙烷甲酰化法,生物发酵法.Secondly, take p - nitrophenol as the raw material, studing the effect of Duff formylation reaction.其次...
Because 2 weeks abdomen is not quite good recently, meet occasionally bellyacke , diarrhoea, concern with this?因为最近2周的肚子不太好, 有时候会腹痛, 腹泻, 是不是跟这个有关?They can also relieve diarrhoea.它们还可以治泻肚.Diarrhoea can make you feel weak,...
ROWLAND Researchers speculate stress may be the cause of the grim statistic.罗兰德研究者推测压力可能是这一可怕统计结果的原因.David Rowland is almost certain to succeed him as chairman on January 1...戴维·罗兰将在 1 月 1 日接替他任主席几乎已成定局。ROWLAND Was it a ...