Evaluation and purchase of opal

Evaluation and purchase of opal:

The evaluation of opal is based on factors such as color, position of the eyeliner, shape of the gemstone, weight, and the like. High-quality cat's eye gem, th.......

Viburnum farming skills

Qionghua is also known as the Eight Immortals, Lonicerae, Viburnum. The Qionghua tree is graceful, flower-shaped and oblate, and the edges are white and infertile. It is like a group of butterflies dancin.......

Explosion-proof monitor failure causes and maintenance methods

A black or white bar appears on the screen of the explosion-proof electrical monitor and scrolls up or down, which is the so-called 50 Hz power frequency interference. This type of interference is caused by the potential difference loop between the front end and the control center, which cause.......

Detailed analysis of "ntn slewing bearing" anti-corrosion and heat lubrication

Home>Bearing knowledge> Detailed analysis of anti-corrosion and heat lubrication methods for “ntn slew.......

Sandstone material classification

Sandstone can be roughly divided into three categories according to different formation modes: igneous rock, sedimentary rock and metamorphic rock.

Igneous volcanic rock rhyolite; coarse shale; Xi.......

What is travertine?

Travertine, scientific name is travertine, English name: (Travertine) is a kind of porous rock, so people usually call it travertine. Travertine is a continental sedimentary rock that is a deposit of calc.......

What is wood carving?

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