Enter "Yangcheng Lake Crabs Gift Certificates" on the Internet, it is not difficult to find that some sellers pre-sale the crabmeal vouchers in advance, the price is generally only 2 to 3 fold, of which many of the expression of the crab is also more vague, male crab 4 two to three two 6, female crab 3 two to two two six, before and after there are 0.4 two errors, Yangcheng Lake hairy crab industry association said that this year will be "half two" as a specification for mandatory norms.
At the same time, in order to prevent crab farmers from fighting a price war, this year the Association will publish the minimum purchase price of Yangcheng Lake hairy crabs for comparison. According to the association, due to insufficient sunshine this year, the water level of Yangcheng Lake was high. In July, it encountered typhoons and other adverse weather effects. This year's hairy crab production will decline slightly from last year and is expected to be listed in the middle or late September.
Taihu Lake hairy crabs are generally listed in the late September of each year, with a small number of listings starting in late September. At this time, most of the commonly sold crabs are female crabs, because only the female crabs can be found on the market, and the crabs are natural at this time. It is much worse, and the meat in the crab's feet is not enough, so it's better to eat the female crab at first.
In the autumn, as the weather cools, the taste of Taihu Lake hairy crabs is getting better and better. By mid-October, Taihu Lake hairy crabs have begun to be listed in the market. At this time, Taihu Lake hairy crabs are the best time. . The best time to eat crabs is from the beginning of November to the end of the crab season.
Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
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