Affected by cold air, from March 1 to March 6, some provinces and cities in Nanping, Ningde and Sanming, which are affiliated to Fujian Province, have a continuous low temperature and rainy process with an average daily temperature of ≤12 °C.  According to the forecast of the Fujian Provincial Meteorological Observatory, in the next three days, there may be continuous low-temperature and rainy weather in the northern region with a daily average temperature of ≤12 °C for three consecutive days. The relevant parties should continue to do the cold-proof work for early rice planting and breeding. The early rice in the seedling stage should pay attention to cover the plastic film, and increase the heat-resistant ability of the seedlings by adding heat phosphorus and potassium fertilizer to prevent rotten cockroaches.
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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Low temperature and rain in northern Fujian will continue, and early rice seedlings need to be cold-proof.
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