Wheel must be used with safety guards. The actual rotational axis of the wheel and its axis of rotation through the center of mass deviation from parallel state called static unbalance wheel. This is usually due wheel uneven density, both ends of the hole and the surface is not parallel or coaxial cylindrical deviation has caused.
2013年9月4日星期三
Since boron atoms on the nitrogen atom at the boron atom becomes oval
Graphite morphology similar to boron nitride, also known as hexagonal boron nitride, is sometimes called "white graphite", which is the most commonly used form of boron nitride. And graphite similar cubic boron nitride is composed of many pieces hexagons. These thin layers correlation between the different structures, but the arrangement pattern from the graphite seen, this is due to the boron atom at the nitrogen atom to grinding wheel an ellipse. This structure reflects the boron - nitrogen-chain polarity. Boron nitride lower covalent nature, making it less Polycrystalline diamond-half for graphite metallic, electric in its hexagonal flakes pi-chain distribution network. The lack of color hexagonal boron nitride, showing lower electron delocalization, which means that its energy gap bigger.
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