Like visible light,UV rays are energy waves released by the sun,only they cannot been seen.Some exposure (暴露) to those waves can do a body good.For example,ultraviolet B(UV-B)rays tell human skin to make vitamin D.Too much exposure can be harmful,though.Overexposure to UV rays can ...
D. help blood in the body flow faster (2) What is the main idea of paragraph 2? A. UV rays are very dangerous to humans B. People like to get a tan despite the danger C. Researchers are confused by people’s action D. People are willing to risk their life to cure cancer (3)...
C.UV-blocking windows are regularly used on spaceships D.the risk of sunburns increases when astronauts are in space 【5】What’s the writer’s purpose of writing the passage? A.To show how astronauts are protected from UV rays. B.To introduce the first human who walked on the moon. ...
UVV Rays & Wavelength Range While the other types of UV rays are invisible, UVV rays exist in a visible wavelength spanning 395 nm to 455 nm. Providing the deepest level curing capabilities, UVV rays are used with UV/Visible formulations for adhesion properties. The uses of UV rays in the...
Solar furnaces are used worldwide to conduct experiments to demonstrate the feasibility of solar–chemical processes with the aid of concentrated sunlight, or to qualify high temperature-resistant components. In recent years, high-flux solar simulators (HFSSs) based on short-arc xenon lamps are more...
A. To show how astronauts are protected from UV rays. 展示宇航员如何免受紫外线的伤害。B. To introduce the first human who walked on the moon. 介绍第一个在月球上行走的人。C. To describe the new technology used in space. 描述太空中使用的新技术。D. To show how we protect ourselves from...
Human eyes are more likely to be damaged by UV rays while skiing in the snow—covered areas than sitting on the beach because . A. Snow produces more UV light than water。 B. People don’t wear sunscreen while skiing as they do while sitting on the beach。 C. The reflection rate of...
These versatile additives keep our cars looking shiny by protecting them from strong ultraviolet (UV) rays that can damage the coating and the car over time. They’re also used in interior automotive, furniture, industrial, and even candle applications to add resistance and performance capabilities...
athe current flows over the entire width of the disk or strip in order to shield the central flux-free region (Bean, flux-free region is current free). 潮流漫过盘的整个宽度或小条为了保护中央无涨潮区域 (豆,无涨潮区域是潮流自由)。[translate] ...
UV-Blocker offers premium UV umbrellas with UPF 55+ protection to keep you cool and shielded from harmful rays. Perfect for sunny outings and skin safety.