aRoof selection for rainwater harvesting: Quantity and quality assessments in Spain 屋顶选择为雨水收获: 数量和质量评估在西班牙 [translate] aThe facility produces health care products, having a chemical plant which has chemical risk. 设施生产医疗保健产品,有有化工风险的一家化工工厂。 [translate] a...
a• Chemical • 化学制品[translate] aGlass fiber cotton heat preservation layer formation; 玻璃纤维棉花热保存层数形成;[translate] aThe glass fiber wadding heat insulating layer is smooth; 玻璃纤维绵热绝缘层是光滑的;[translate] a( if there is a ) ribwaistband (如果有a) ribwaistband[translate...
Veratraldehyde is a colorless to pale yellow lumps or fused solid with a distinct aroma. It is utilized as a food flavoring agent and finds applications in cosmetics, household items, and pharmaceuticals. Its chemical properties enable condensation reactions with various compounds, leading to the ...
Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. For this purpose, adimensionlessquantity, thePauling scale, symbol χ, is the most commonly used. The electronegativity of Tantalum is: χ = 1.5 In general, an at...
What is yttrium atomic number? The atomic number39is written in digital numbers to represent that yttrium oxide is important in micro-wave ovens, where with iron, is used as microwave-filters. What is the 70th element? Ytterbiumis a chemical element with symbol Yb and atomic number 70....
Chemical energy to kinetic energy 1. Which of the equations below shows a possible fission reaction for _{92}U^{235}? a) _{92}U^{235} + _0 n^1 right arrow _{53}I^{133} + _{39}Y^{99} + 3 _{0}n^{1} b. _{22}Ti^{48} + _{70}Yb^{187} right How matter and ...
材料 6天休假期间，单位需要每排一人值班。财务、研发、人事、后勤、法务和销售6个部门各推荐了2人，值班人员从这12人中选择，每人至多值班一天。安排要求（1）第二天和第四天不安排法务部门的人值班；（2）若安排后勤部门的人值班，则只能安排在法务部门的人值班的前一天；（3）若安排研发部门的人值班，则只能...
Rhubarb can be used to treat multiple diseases, which is related to the complex chemical com- position caused by plant species, growth environment, harvest time, processing and so on [8]. Therefore, meth- ods that can identify the most components in rhubarb are widely used for species ...
Bayir,Eylem - 《Journal of Chemical Education》 被引量: 8发表: 2014年 Learning by playing: how to create the perfect learning game for and with optics For children, playing and learning is often one thing. They learn while playing and by playing the right gamesthey learn a lot. It is ...
X-ray fluorescence (XRF): a non-destructive analytical technique used to determine the chemical composition of materials Overview X-ray Fluorescence (XRF) XRF occurs when a fluorescent (or secondary) X-ray is emitted from a sample that is being excited by a primary X-ray source. Because this...