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    New energy vehicle waterproof battery top cover

    New energy vehicle waterproof battery top cover

    2020-07-17
    Instance (instance) In object-oriented programming, a "class" is called an "instance" after instantiation. "Class" is static and does not occupy process memory, while "instance" has dynamic memory. In the database, it represents a collection of programs. For example, in Oracle, instances are database programs that can support the operation of the database.
    New energy vehicle waterproof battery top cover
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