Observing a cuboid, you can see at most 3 faces at a time, and at least 1 face.

According to the meaning of the question, put a cuboid on the table for observation.

From different angles, you can see at most 3 faces, and at least 1 face.

So the answer is: 3; 1.

Normal is 3 faces, at least 1 face. If you consider factors other than the proposition, you can see at most 6 faces and at least 0 faces. There is a foreign body, you know.

Without the help of foreign objects, if you observe with your eyes, there are two situations:

Case 1: When the side of the cuboid is longer than the distance between the eyes of the observer, the normal answer is valid;

In case 2, on the contrary, when the length of each side of the cuboid is less than the distance between the eyes of the observer (eye distance), the side with the smallest side length of the cuboid is placed between the eyes, and at most four sides of the cuboid can be observed.

A cuboid is a regular quadrangular prism with a rectangular bottom. A cuboid consists of six faces, and the opposite faces are equal in area. There may be two faces (four faces may be rectangles, and all six faces may be rectangles) that are squares.