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    Xinzhizao
    Maintenance Basis
    Welding Technique
    Electronic Circuit Basis
    iPhone Maintenance
    Exterior Screen Maintenance
    Andriod Phone Maintenance
    MacBook
    Laptop Maintenance
    Desktop Computer Mainboard Maintenance
    Graphics Card Maintenance
    Series of courses
    Microphone fault repairing
    Domestic mainboard repair
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    Maintenance tools and platforms
    Computer basis
    Nouns explanation of maintenance
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    Video
    70. Reset signal
    Nouns explanation of maintenance
    free
    56person
    Video
    69. Clock signal
    Nouns explanation of maintenance
    free
    48person
    Video
    68. High level and low level
    Nouns explanation of maintenance
    free
    59person
    Video
    67. Grounding name and symbol
    Nouns explanation of maintenance
    free
    57person
    Video
    66. Grounding introduction
    Nouns explanation of maintenance
    free
    45person
    Video
    65. Power supply name and symbol
    Nouns explanation of maintenance
    free
    53person
    Video
    64. Power supply introduction
    Nouns explanation of maintenance
    free
    30person
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