In a chemistry experiment,our teacher showed us how iron when it was heated. A. expanded B. contracted C. rusted D. formed 相关知识点: 试题来源: 解析 A 答案A 解析 本题考查的是动词辨析。expand膨胀;contract收缩;rust生锈;form形成。句意为:在化学实验课上,我们的老师向我们演示铁是怎样受热...
Though the move was only one-quarter of a mile, it took five bulldozers 12 days to complete the trek. Helping out the bulldozers were 100 hydraulic jacks that lifted the building and 70 dollies that formed a temporary foundation for the journey through the city streets. Artspace conducted ...
Unlike traditional armor, this soft body armor is not made out of pieces of metal; it is formed from advanced woven fibers that can be sewn into vests and other soft clothing. Hard body armor, made out of thick ceramic or metal plates, functions basically the same way as the iron suits...
Norman Larsen, an employee of the newly formed Rocket Chemical Company, created WD-40 in 1953. It was produced specifically for use in the aerospace industry. Aerospace contractor Convair was the first to use WD-40, applying it to the outer skin of the Atlas Missile to protect it from rust...
sawdust– n. tiny particles of wood that are formed from sawing or sanding wood grass clipping– n. the cut grasses that are left behind—or captured in a grass catcher—by your mower when you cut your lawn straw– n. the dry stems of wheat and other grain plants ...
How can the mixture of iron fillings and sulphur be separated? Describe how cyclotrons work. Why does transmutation occur? What is condensation polymerization? Give an example. How can you separate NiCO_3 from NaCO_3? Explore our homework questions and answers library ...
Then, the organic phase was separated and transferred into a beaker to evaporate the remaining solvents at 110 °C during different drying periods to ensure the complete removal of ethanol, hexane and water, resulting in brown-reddish waxy solids. Iron(III) oleates were named as FeOL_X, ...
Theoretically, when the universe was formed, there should have been equal amounts of matter and antimatter; however, our universe consists primarily of matter. So, what happened to all of the antimatter? This is a major area of research in theoretical physics (such as quantum physics and ...
KEF was started by former Peace Corps Volunteer, Bradley Broder and local community leader, Dominic Muasya, to keep kids in high school when their means did not allow. NKCEF was formed after a group of families from McLean, Virginia accompanied their children’s high school teacher, Hon. ...
The electric current generated by the liquid iron creates the magnetic field protecting Earth, according to NASA. Iron is also found in the cores of all of the planets in the Solar System. Iron is the heaviest element formed in the cores of stars, according to JPL. Elements heavier than ...