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ответить на вопросы (12 вопросов) • How is the telephony defined? • What are the main parts of a telephone receiver? • In what cap are they housed? • Why do telephone sets and lines need protection? • What is a fuse? What is its function? • What is the main difference between wireline and wireless telephones? • Do wireless telephones have any connections? • Is the mobility of cordless telephones limited or is it limitless? • How large may be a service area of cellular telephones? • Are the weight and size of cellular telephones increasing or decreasing? • What are the two types of in-flight radiotelephones? • Why may satellite-based systems be employed anywhere in the world?