California dogtooth violet with creamy white flowers sometimes yellow - tinged.加利福尼亚州的一种赤莲,花乳白色,有时淡黄色.North American dogtooth having solitary white flowers with yellow centers and blue - or pink - tinted exteriors.北美的一种赤...
这就是所谓的催化裂化.It is known as catalytic cracking.裂化是使较重的低挥发性的碳氢化合物分裂成较小分子的化学分裂.Cracking involves the chemical breakdown of higher, less volatile hydrocarbons into smaller molecules.FCC(流化催化裂化 ) 是炼厂生产汽油的主要方法之一.The Fluid Catal...
The presence of angina indicates significant coronary ischemia.心绞痛本身说明有明显的冠状动脉供血不足.Their excellent survival during autolysis in vitro and ischemia in vivo is consistent with this.与此一致是,在体外自溶时和在体内局部贫血时,它们出色地幸存下来.Leptin im...