Causes of fertilizer damage in greenhouses in winter

In winter, crops in greenhouses often suffer from chemical fertilizer burning, ammonia hazard and nitrous acid gas poisoning.
Ammonia poisoning hazards are divided into two types: traumatic type and internal injury type. The traumatic hazard is mainly caused by damage to the leaves of

Comment on the actual operation of the 4th National NC Skills Competition

The 4th National CNC Skills Competition was held in Fushan City, Guangdong Province from December 19th to 26th, 2010. Seventy-one outstanding athletes from 31 provinces and cities participated in four projects. The competition of the seven groups. The players' good spirits, exquisite op

Floor heating insulation board production

Extruded polystyrene foam (referred to as XPS), insulation board

1. Multi-purpose machine can produce 5cm, 10cm, 15cm and other lightweight insulation composite panels, lightweight insulation comp

No. 20 round steel stable price!

Part processing requirements

The part is a screw with adjustable span width of the adjustable wrench. The material is round steel of 20, the flank has certain roughness requirements, the screw part of the cutting part needs chamfering, and the middle pin hole and t

Marine paint definition

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Basic information of aluminum silicate

Aluminosilicate: It is produced by using hard clay clinker as raw material, melting or blowing into fiber by electric resistance or electric arc furnace.

Characteristics: Low thermal conductivity

Led energy-saving lamps basic overview

LED (Light Emitting Diode), a solid-state semiconductor device that converts electricity directly into light. The heart of the LED energy-saving lamp is a semiconductor wafer. One end of the chip is attac