Major Composite of thc SeaIant is bisphenol A epoxy resin, dicyandiamide, ureido compound and modifier etc.以双酚A环氧树脂 、 双氰胺 、 脉及改性材料为主要成分配制的胶粘剂可在中温迅速固化.The less stable compounds were converted into a compound called Delta-...
他们把黄河水引上高原,使300公亩棉田获得丰收.They have lifted water from the Yellow River onto the high land and reaped a good cotton harvest on a 300 - acre tract.公顷公制面积单位,等于100公亩 ( 2.471英亩 )A metric unit of area equal to 100 ares ( 2.471 a...