If everyone went vegetarian, we wouldn’t feed more people. We would instead have to put more land under the plow. In fact the entire dream of the insane left of sticking us all in stack a prol apartments makes perfect sense with this, except they think the rest of the world would be...
While in 2013, Zhen [6] made great achievements in the research of underground ventilation monitoring system in coal mine. For underground mines, with the continuous development of mining transportation industry, rail transport has gradually been replaced by trackless transport. However, there is no ...