1 Introduction Spinning technology, also known as metal spin forming technology, is formed by rotating the force point from point to line from line to surface, while giving a certain pressure in a certain direction to deform and flow the metal material along this direction. The technology of a cer
Yesterday (January 30), the national cooling range was further narrowed, and most of the temperature warmed up. According to the latest meteorological data, as of 14:00 yesterday, except for Guizhou, Hunan, Guangxi and other places, there is a small temperature drop, and most other areas are warmin
 1. Ammonium bicarbonate and urea cannot be mixed. The amide nitrogen in urea can not be absorbed by crops. It can only be used by crops after being converted into ammonium nitrogen by the action of gland enzymes in the soil. After carbon iron is applied to the soil, the soil solution will be
Brand: WELKEN model: 220 227 8411 The cable lock is economical, flexible and practical. It can lock door valves of various sizes. It can also lock multiple electrical cabinet switch locks. It is easy to carry and has a wide range of applications. The steel cable is composed of stainless steel w
First, the basic knowledge 1. What is welding? A: Two or more materials (same or different), by heating or pressurizing or a combination of the two, to achieve the combination of atoms to form a permanent connection process called welding. 2. What is arc? Answer: A strong and long-lasting gas d
 1 Cultivation of strong seedlings: Suitable varieties for cultivation in the protected area include Jingyin 8625 , Xia Bin, Taiwan No. 11 , Grassland No. 21 , and crispy soft-pea peas 80-11 . Seeds need to be treated at low temperature to promote bud differentiation, so that the inflore
Linyi Fertilizer Network Copyright Ginkgo biloba needs to continuously absorb various nutrients in the soil at all stages of growth and development. In order to ensure that there are sufficient quantities and types of nutrients available in the soil, it is necessary to apply fertilizer in a timely