transmission systems. like roadway and water distribution systems , a loop or ring is used to provide redundancy . sdh , sonet and wdm systems are often configured in self-healing rings. description[ edit ] the system consists of a ring of bidirectional links between a set of stations, typically using optical...
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exams class science physics electricity human eye and colourful world light - reflection and refraction magnetic effects of electric current sources of energy chemistry acids, bases and salts carbon and its compounds chemical reactions and equations metals and non-metals periodic classification of elements...
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here is a test you can perform without the expense of paying an independent lab. to compare the general flow rates of filters: procure a set amount of amount of oil (i.e gal. we recommend a single viscosity. w works well at around degrees f), the oil filter elements to be tested, a funnel, some sort...