Some photography topics, thank you.

1.72 formula is used to develop (c) reverse film b film c photo d black and white film 2. The film you should choose to take portrait photos is (B )A split film B full color film C color blind film D X-ray film 3. When restoring a photo, its lighting source should be from (a) the top of the left, the top of the back, the top of the right, the top of the front and the top of the front. 4. The flash index is 24, and the object distance is 3m. Use the aperture (8) af8bf11cf16df222 5. After the color photo sample is enlarged, its color is yellow. Should add (a) filter A yellow B red C cyan D green 6. The low-key portrait adopts (C )A plane light, B-side backlight, C scattered light and D full backlight.