sighting board वाक्य
उदाहरण वाक्य
मोबाइल
- Where particularly poor background contrast cannot be avoided, a " sighting board " ( usually painted white ) can be placed behind the arm to provide adequate contrast which improves visibility.
- Most British road traffic lights are mounted vertically on a black rectangle with a white border ( forming a " sighting board " ) and so dichromats can look for the position of the light within the rectangle top, middle or bottom.
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