First, the peripheral branches are no longer short-cut when pruned, and at the same time, excessive external thinning should be avoided. The branches and branches should be used more to handle the branches, so that they can maintain their advantages but are not prosperous.
The second is to prune the leaders of the central government. It is necessary to maintain the trees not to exceed the required height, and to lightly put away the results of the original central leadership and eliminate the competition.
The third is the pruning of the main branch. The competing branches at the front of the main branches can be removed or cut short, the peripheral branches can be reduced, the branches can be trimmed and the tree can be trimmed, the tree vigor can be eased, the growth potential of the inner litchi can be promoted, and the illumination can be solved. On the weak main branch, pay attention to raise the branch, reduce the amount of buds on the main branch front to restore its growth potential.
According to performance characteristics and scope of application, Medical masks can be divided into: medical protective Masks, medical surgical masks, general medical masks.
Medical protective masks: Medical protective masks are suitable for the protection of airborne respiratory infectious diseases by medical personnel and related staff. Wear when in contact with airborne or droplet-borne respiratory infections. It can filter the particles in the air and block droplets, blood, body fluids, secretion droplets, etc. It is a disposable product. Medical protective masks can prevent most bacteria, viruses and other pathogens. WHO recommends that medical personnel use protective masks against particulates to prevent virus infection in the hospital air.
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