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The hexagon screws are rusty, you need to remove the rust from the screws first, you buy a bottle of rust remover and spray it to try.
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It seems to be hexagonal.
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Inner hexagon, don't you recognize?
Ceiling lamp, there are 4 buckles in the gap in the middle of the alloy.
If it is really like you can recognize the situation under the darkness is P250V100W, then the G4 20W12V bulb you bought is low-voltage, of course, it will go out or explode, you buy a 220V G4 bulb and try it to see if it is right!
Keeping pigeons is something that needs to be raised from a young age so that they will live in the place you designate, and I have been incubating pigeon chicks for a long time.
It will not affect, the whole cycle is the pressure provided by the supply station, and the resistance of your radiator is small and basically no resistance.
People think highly of you, you should be happy, you don't need to be quiet.