The Central Meteorological Observatory issued a national weather forecast at 17:00 today: temperatures in most parts of the country have risen, and some parts of the south are foggy.
In the next three days, temperatures in most parts of the country will gradually pick up. There are small to medium snow or snow showers in the western and northern parts of Xinjiang, eastern Tibet, eastern Qinghai, southern Gansu, northeastern Inner Mongolia, and northeastern northeastern regions. Among them, the northern part of northern Xinjiang and the northeastern part of Heilongjiang have some areas. Heavy snow. There are light rains or showers in central and southern Shaanxi, eastern southwestern China, eastern Yunnan, northern Guangxi, western Hubei, and western Hunan.
From night to tomorrow morning, there are light fog in the south of Huanghuai, Jianghuai, Hanshui, the eastern and southern parts of southwestern China, the south of the Yangtze River, and the northern part of South China, including western Chongqing, central Hubei, central Hunan, western Jiangxi, eastern Guizhou, and south-central Yunnan. In some parts of northeastern Guangxi and northeastern Guangdong, there are fogs with visibility less than 1000 meters, and visibility in some areas is less than 200 meters.
The specific forecast is as follows:
From 20:00 on the 17th to 20:00 on the 18th, there were light snow or snow showers in western Xinjiang, southeastern Qinghai, northeastern Tibet, northeastern Inner Mongolia, and most parts of Heilongjiang; some areas in the western part of the Sichuan Basin were light rain or showers. There are 4 to 6 winds in northern Xinjiang, western Gansu, and Inner Mongolia. The Bohai Sea and the Yellow Sea have a southwesterly wind of 5-7 grades and 8 winds of gusts; the northeastern winds of the Taiwan Strait, Taiwan's east and south seas, and the north and south of the South China Sea have grades 5-7, and gusts 8; northwestern South China Sea has 6 to 8 northeast winds.
From 20:00 on the 18th to 20:00 on the 19th, there are small to medium snow or snow showers in northern Xinjiang, eastern Tibet, southern Qinghai, northern Sichuan Plateau, southwestern Gansu, northeastern Inner Mongolia, Heilongjiang, most of Jilin, and north of Liaoning. Among them, there are heavy snow in parts of northern part of northern Xinjiang; light rain or sleet in northwestern Yunnan; light rain or showers in southeastern Sichuan, northern Guizhou, and northeastern Yunnan. There are 4 to 6 winds in northern Xinjiang, western Gansu, Ningxia, most of Inner Mongolia, northern North China, and eastern Huanghuai. Most of the Bohai Sea and the Yellow Sea have 6 to 7 grades, and the southwesterly winds of the 8th grade of the gusts turn northwestward; the northerly winds of the 6th to 6th grades in the northern part of the East China Sea; the northeast winds of 5 to 6 grades and 7 gusts in most parts of the South China Sea.
From 20:00 on the 19th to 20 o'clock on the 20th, there are small to medium snow or snow in northern Xinjiang, eastern Tibet, eastern Qinghai, central and southern Gansu, northern Sichuan Plateau, northeastern Inner Mongolia, Heilongjiang, and eastern Jilin. In the northeastern part of Heilongjiang, there are heavy snows; there are light rains or showers in central and southern Shaanxi, eastern Sichuan, Chongqing, western Hubei, Guizhou, western Hunan, eastern Yunnan, and central and northern Guangxi. There are 4 to 6 winds in northern Xinjiang, western Gansu, most of Inner Mongolia, and northeastern China. There are 5~7 northerly winds in the Bohai Sea and the northern part of the Yellow Sea; there are 5~7 easterly winds in the Taiwan Strait and the south-central South China Sea.
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Handling Gratings: Gratings require special handling, making them prone to fingerprints and aerosols. Gratings should only be handled by the edges.
Holographic gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-0.8um
Grooves per mm: 1,200 to 3,600L/mm
Diffraction: >70%
Ruled gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 0.2-15um
Grooves per mm: 50 to 2,400L/mm
Diffraction: >70%
Concave gratings:
Specifications:
Ruled area: <=70 * 70mm
Wavelength range: 200 to 900um
Grooves per mm: 490 to 1,200L/mm
Diffraction: >70%
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