The strength of the sun's ultraviolet (UV) radiation is expressed as a Solar UV Index or Sun Index.The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the ...
China has enacted an immediate ban on the export of dual-use items related to gallium, germanium, antimony, and superhard materials to the U.S., in response to Washington's latest crackdown on the ...
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