Calcium cyanamide is poisonous and irritating to the skin.氰氨化钙是毒性物质,对皮肤有刺激性.A new process, urea - calcium cyanamide method, for producing thiourea from urea and hydrogen sulfide is proposed.利用尿素和硫化氢等原料制备硫脲, 提出了尿素 - 氰氨化钙法...
A rubber ball bounces well.橡皮球弹力好.Although fatigue shows readily on Carter, he bounces back quickly.卡特虽然容易显出疲劳的样子, 但他恢复得很快.Sunlight bounces off the light - colored surface, so It'stays cool on hot days.阳光反射表面看起来教浅的颜...