火药是希腊火的直接衍生物.Gunpowder was the lineal successor of the Greek fire.这类合成物是亚硝基羟胺衍生物.These compounds are nitrosohydroxylamine derivatives.很多环戊烷的衍生物在这个范围也出现吸收.Many cyclopentane derivatives also absorb in this region....
From the structure of the circuit is divided into cross - straight - to pay and pay - cycloconverter .从其电路的结构上分为交 — 直 — 交和交 — 交变频器.Circuit - oriented model of cycloconverter is developed by adding tube - changing mode an...
Stable hemihydrate agglomerates with good filtering properties were obtained.获得具有优良过滤性能的稳定的半水物晶团.Hemihydrate can be used instead of gypsum.半水物硫酸钙可以用来代替石膏.An organic wetting agent or foam suppressant is quite helpful in t...