Belgium Ventilator In Short Supply, Pre-Trying New Treatments

Belgium Ventilator In Short Supply, Pre-Trying New Treatments

Due to the growing epidemic of new crown pneumonia and the global shortage of ventilator resources, medical staff in some European countries have begun to try to modify di...
Ball bearings are all around us

Ball bearings are all around us

The ball bearing is a type of rolling bearing. The spherical alloy metallic ball is mounted between the internal metal ring and the outer metallic ring. The rolling approa...