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What are the symptoms of Delta…

• Model NO.: SV21
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The basic inspection flow marks the surface of the object to be inspected. According to the basic requirements for photogrammetry, non-encoded mark points and coded mark points need to be attached to the surface of the object to be inspected. The non-coded mark is a black-white dot hig…

First, the favorable environment for the development of submersible pumps (I) The increase in the demand for groundwater will promote the continuous increase in the demand for submersible pumps for wells. With the increase of the global population and social and economic development, the water …

In recent years, due to unscientific fertilization operations and environmental pollution and other factors, soil acidification and other phenomena are very serious, and the impact of soil acidification on crops is very obvious. Taking tomato cultivation as an example, the pH is …