On condition of infrequently disassembling and light load, determine the type of threaded fasteners used to fasten the upper part with through holes and the lower part with threaded holes.(Single option: 10 points)
A、Screwjoint;
B、Studjoint;
C、Boltjoint;
D、None
发布时间：2025-07-25 17:50:34
