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What is Ucem in the circuit?
In any book or paper, symbols must be defined before they can be quoted. Just like solving arithmetic problems, the distance between Xiaoming's home and school must be set to "X" before equations can be formulated with "X". So you should look for its explanation in your book, maybe in the preface? Appendix?

Generally, in electronic books and periodicals, "Ucem" represents the maximum voltage between transistors C and E. ..