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Question:

What is the ratio of cement and sand to the open trough of the wall?

What is the meaning of "cable tray: 200 * 100 middle strip" in electrical engineering

Answer:

Is the TV connected to the cable? If you can press the TV / av key
200mm wide, 100 high, the middle partition is divided into two halves. Cable bridge is divided into trough, tray and ladder-type, mesh and other structures, by the bracket, arm and installation accessories and other components. The inner frame of the building can be set up independently or attached to various structures and corridors. It should be characterized by simple structure, beautiful appearance, flexible configuration and convenient maintenance. All parts are galvanized. , Installed in the building outside the bridge
According to the national standard for the blue is the zero line, brown is the line of fire but you are not so strict when used, in addition to the ground, the two lines can be mixed.
Very simple. All electrical appliances as long as the yellow and green is the ground line. The other two because it is alternating current, plug direction is not fixed, so which one may be FireWire, there may be zero line.

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