In order to strengthen and standardize coal mine geological work, improve coal mine safety and high-efficiency mining geological protection capabilities, and effectively prevent coal mine accidents, on March 4th, the accident investigation division of the State Coal Mine Safety Supervision ----more
In the current vegetables, fruits and other crops cultivated in pollution-free, micro-biological pesticides more and more attention. In order to improve the application effect and control effect of the microorganisms in vivo, it is necessary to guard against misunderstandings ----more
Metal Processing Online News On April 8, Zhongwang Software released Zhongwang CAD+ SP2, the second enhanced version of CAD+. As an old user of Zhongwang CAD+, I first tested this version for about one week. The result is exciting: users who use CAD+ or CAD+ SP1 do not need to uninstall the origina ----more
The choice of stairs is related to the connection of different spaces in the whole room, and the frequency of use in the home is also high. Solid wood stairs and steel wood stairs are two representatives in the stairs. How should consumers choose? The solid wood staircase is easy to make and ----more
1) The lifting machinery usually has a large structure and a complicated mechanism, and can complete the lifting movement and the horizontal movement. For example, a bridge crane can complete three movements of hoisting, cart running and trolley operation; the gantry crane can complete four mo ----more
With the rapid development of broadband digital optical transmission device technology and digital video technology, digital video optical transceivers have begun to move toward the market and gradually replaced the analog optical transceiver market, ushering in the era of high-speed development of ----more
First of all, you should carefully read and read more about the monologue of ancient jade. These academic works are rich in knowledge. For example, "The Ancient Jade Picture Examination" by Wu Dazheng in the late Qing Dynasty, "The Complete Works of Chinese Art: Jade Objects&quo ----more