Regarding spare parts
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What is the difference between driving spare parts, testing spare parts, and random spare parts?
Take door locks as an example: trial spare parts – during home renovation, a simple door lock is installed first; once the renovation is complete and the house is handed over, a proper door lock is put in place. Random spare parts – A standard door lock usually comes with 6 keys, and some of these keys serve as spare parts. Car spare parts —— Once a door lock is in use, if it gets damaged, a lock replacement technician will replace the lock core, and the lock core is considered a car spare part.