A circular connector is a type of connector whose basic structure is cylindrical and has a circular mating surface. In the interconnection classification, it belongs to category 5 and is used for interconnection between devices. http://www.antenkconnector.com..../board-to-boad-conne

The Courses for Early Language Education reflects Xuba Language Enlightenment's value orientation in the process of children's learning of their mother tongue, and it is one aspect of Xuba Language Enlightenment's multi-dimensional value concept. http://www.china-xuba.com/book....s-for-early-language

A grinding wheel is a wheel used for grinding. Grinding wheels are composed of abrasive compounds and are used for various grinding (abrasive cutting) and abrasive machining operations. Such wheels are used in grinding machines. The wheels are generally made with composite material . http://www.daotian-tech.com/grinding-tools/

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Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop, or strop, is often used to straighten and polish an edge.http://www.taideasharp.com/kni....fe-sharpener/diamond