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Anonymous users2024-01-24You're from that place1! Is your standard outfit bronze? Or iron? Plastic? Or is it paper?
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Anonymous users2024-01-23That one is not expensive, a few cents a piece.
Optical principle of portal mirror imaging.
The door mirror is composed of two lenses When we look out from the inside of the door, the objective lens L1 is a concave lens, and the eyepiece L2 is a convex lens (see Figure 1 for the optical path) The focal length of the objective lens L1 is extremely short, and it AB the outdoor person or object AB into a very small upright virtual image A B, this image just falls in the first focus of the eyepiece L2, L2 plays the role of a magnifying glass, and finally obtains a more magnified upright virtual image A B, which is just around the bright distance of the human eye, and can see clearly for the situation outside the door >>>More
Buy a cat's eye first. Buy an iron hole opener in comparison with the diameter of the cat's eye. Just ask the carpenter to open the hole. What you are buying is not an anti-theft door, it is a type of fire door. I've come across quite a few at Vanke.
On the market, the main light control password anti-theft door of Zhejiang Pufeng Dading Door Industry Co., Ltd. is the best.
Anti-theft door locks generally do not enter the water, the internal parts generally do not need maintenance, mainly the lock cylinder, do not add oil in the keyhole, to use the pencil of the lead to pour, repeatedly plug and unplug the key to turn the key, it will be flexible.
How did you open it, I'm also in such a situation now, how to reset or open the keyhole protection password?