The vertical wellbore construction method can be divided into excavation, masonry and single-row operation, parallel excavation and excavation work, excavation and masonry mixing operations, and excavation, masonry and safety.
1. Digging and arranging single-line operations: long-si.......
In July, the Chinese auto market officially ended its journey in the first half of 2017. Looking back at the large and small events that occurred in the domestic automobile market in the past half year, the most noticeable are.......
With the development of smart agriculture, directing agricultural production and carrying out production activities have begun to make judgments and decisions based on big data. The acquisition of big data is based on professional environmental monitoring equipment such as small .......
In the first half of 2017, the automotive industry has witnessed drastic changes, and major component companies have also built new factories at home and abroad to adapt to the new market situation.
Recently, a total o.......
There is a reasonable criterion for rock blastin.......
Realistic and rational development and mining methods are fundamental measures to prevent impact pressure. The main principles are:
1. When mining mining groups, the development of layout should be conducive to the mining of the liber.......