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Classification of communication cables
- Communication cables can be divided into the following three categories:1, long-distance cable: long transmission distance, generally multiplexing, mostly buried directly in the ground, in a few cases by overhead installation, or installed in the pipeline.2, the cable conductor: "in the cable, and the logarithmic in pairs.". Generally installed in the pipe, a small amount of city cables are attached to buildings or overhead installations.3, office cable: mainly refers to the use of the communication cable telecommunications bureau, usually installed in the frame, there are installed in cable chute; Office cable for telecommunication station transmission equipment and switching equipment, office equipment and other internal. In the telecommunication office, in order to prevent fire, it is sometimes necessary to add a flame retardant sheath to the office cable.s
Where to sell waterproof geotextile
- Building materials market should have hope to help yous
What are the architectural features of Chinese gardens?
- The South Garden is often an extension of the house, and the base is smaller, so it must create more scenery in the limited spaces
What kinds of analytical instruments and equipment should be used in drug analysis experiments?
- Instrumental Analysis: high performance liquid chromatography, gas chromatography, nuclear magnetic resonance analysis, mass spectrometry, and LC-MS GC-MSs
Tire advice on a motorcycle?
- try motosport, rocky mountain, or dennis kirk. Motosport had the fastest shipping and best customer service.s
Is it possible to weld pig iron with ordinary welding machine?
- AX series arc welding generator, ZX5 SCR (thyristor) DC welding rod, hand arc welding machine, ZX7 inverter welding rod arc welding machine, suitable for welding cast iron material.s
According to the "Construction Engineering Quality Management Regulations" to witness the sampling requirements, that kind of material without sampling inspection, can be used for workers
- Except for cement, building sand, building stone, concrete foolish seal, bronze, reinforced concrete structure, reinforced concrete parts, reinforced concrete blocks, blocks and blocks, roads and Basic backfill materials, energy-saving materials, etc. need to witness the sampling test, the other materials are not sampling inspection. Can be used for construction. What specific material, to see the specific construction drawings in the specific requirements of the material.s
how to calculate load capacity of crane?
- Very complicated - strength of boom and tower, angle of boom and thus distance of load from base, size and position of counterweight, location of support arms. A specific crane may have different capacities depending on whether an extension boom is used (reaching higher and farther out with a reduced load)s