Depending on what kind of equipment it is, it can be divided according to its use: easy-to-wear spare parts, such as lubricating oil, wear packing and other equipment wear parts; non-easy-to-wear spare parts, such as sudden accidental damage, but must still be used. used. For example, the motor is burned out. According to time, short-term spare parts, such as sealing rings, oil seals and so on. Spare parts that have been in stock for a long time, such as the support parts of a certain equipment, may be obsolete. The parts are not damaged yet, but you have to keep them. If something goes wrong, it is too late to buy them now.
Pure keyboard typing, the above is for reference only.