Non-tapping screws are machine Screw, the pieceworker to be fastened must be tapped with taps in the screw hole in advance to match the screw threads.
The difference between tooth screws and other screws depends on whether they can be used together with nuts. Tooth screws can be used with nuts. And relative to the screws of other teeth, there are self-tapping screws. The nut of this kind of screw has no bow teeth. As for the standard teeth and fine teeth are only different pitch, it is the nut of the machine screw
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There will be a large range of rain and snow in the south.
First, important weather
Large-scale rain and snow weather will appear in the southern region from 1.8
From the 8th, there will be a wide range of rain and snow weather in the southern region. Among them, parts of southern Jianghuai, southern Jianghan, northern Jiangnan and western regions have small to medium snow, local snow, and parts of central and western Guizhou and southern Hunan. There is freezing rain in the area.
2. The northern part of Susong in the Sichuan Basin is foggy
In the morning to morning, some areas in the North China Plain, Huanghuai, Jianghuai, Sichuan Basin, Jianghan, and the north and south of the Yangtze River have light fog or haze. Among them, there are local visibility in the southern part of the Sichuan Basin, northern Susong, and northwestern Jiangxi. Fog less than 1000 meters.
Second, the specific forecast for the next three days
From 08:00 to 8:00 on the 7th, there were light snow or sleet in the southeastern part of Qinghai, the northern part of the western Sichuan Plateau, southwestern Hubei, northwestern Hunan, northern Guizhou and other places, and the snow in the local area; There are light rains or showers in parts of the eastern and western parts of southern China, and some parts of central and western Guizhou have freezing rain. There are about 5 northerly winds in the central and eastern parts of Inner Mongolia. There are 7-8 winds in the southwestern part of the South China Sea, and the gusts can reach 9-10.
From 08:00 to 8:00 on the 8th, there are small to medium snow or sleet in the northwestern part of Xinjiang, the southeastern part of Qinghai, the northern part of the western Sichuan Plateau, the south-central Jianghan, the southern part of the Yangtze River, the northern part of the Yangtze River and the western part of Guizhou, and the northern part of Guizhou. There are heavy snow in some areas of southern Anhui; there are light rains or showers in the southwestern part of the southwest, south-central southeastern China, and southern China, with local rain, and some parts of central and western Guizhou have freezing rain. There are 4 to 5 northerly winds in the central and eastern parts of Inner Mongolia. There are 6 to 8 northeast winds in the Taiwan Strait.
From 08:00 to 10:00 on the 9th, there were small to medium snow or sleet in the north of Xinjiang, the southern part of the western Sichuan Plateau, the southern part of the Yangtze River, and the north-central Guizhou. There were light rains in the southwestern part of the country, southeastern part of the southeastern part of China, and southern China. Showers, moderate rain in some areas, freezing rain in parts of central and western Guizhou and southern Hunan. There are 4 to 5 northerly winds in eastern Inner Mongolia and other places. The northeastern part of the Taiwan Strait and the northeastern part of the South China Sea has a northerly wind of 7 to 8 and a gust of 9 winds.
January 07: National weather forecast for the next three days
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