911查询·英语单词
名词催化剂,触媒剂
1. 活化剂:此外,活化剂(activator)在低固体焊剂方程式中的份量少于1%,即使焊剂密度出现微小变化,亦会影响这些焊剂的效能. 最准确的控制方法,是以滴定法来决定焊剂活化剂之份量. 滴定法找出焊剂的酸度值,凭此设定焊剂的活化水平,
2. 催化剂:有些黑色的庞然大物在水面下绕圈圈转,所有观众都屏住呼吸,静静等著即将出现的惊人表演. 不久,一位身穿潜水衣的训练师划著印地安小皮船出现,他很快的就被这些巨大的杀人鲸包围住. A:催化剂(Activator)B:行为(Behavior)C:结果(Consequence)
3. 活性剂:一种传统的低固、免洗助焊剂通常含有大约2%的活性剂(activator),或固体,但可以高达4%的固体. 在双波峰工艺中经常与这些助焊剂的使用有关的缺陷是锡球(solder ball)和锡桥(solder bridge). 因此,
1. Known as a tissue plasminogen activator, the drug is injected intravenously to dissolve clots and reinstate blood flow.
noun
1. (biology) any agency bringing about activation
a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription