The process of making an impression material conductive for use in electroplating or other electroforming processes is called "metallizing". Metallizing is the process of coating a non-conductive material, such as an impression or a model, with a thin layer of conductive material, such as metal, to make it electrically conductive. This is typically done by applying a conductive coating, such as a metal or graphite, to the surface of the material using a spray gun or other application method.
The conductive coating forms a thin layer over the surface of the material, allowing electrical current to flow through it. Once the material has been metallized, it can be used in electroplating or other electroforming processes, where a layer of metal is deposited onto the surface of the material by passing an electrical current through it. The metal layer can then be used to create a mold or casting, or for other applications where a conductive surface is needed.
Electroplating, iontophoresis, and galvanizing are also related to the use of electrical current in various processes, but they are not specifically related to the process of making an impression material conductive through metallizing.
Two designs A and B, shown in the figure, are proposed for a thin-walled closed section that is expected to carry only torque. Both A and B have a semi-circular nose, and are made of the same material with a wall thickness of 1 mm. With strength as the only criterion for failure, the ratio of maximum torque that B can support to the maximum torque that A can support is _________ (rounded off to two decimal places).
At a given frequency, the storage modulus \( G' \) and loss modulus \( G'' \) of four biomaterials are shown in the table below. Which of the following option(s) is/are CORRECT?

Two designs A and B, shown in the figure, are proposed for a thin-walled closed section that is expected to carry only torque. Both A and B have a semi-circular nose, and are made of the same material with a wall thickness of 1 mm. With strength as the only criterion for failure, the ratio of maximum torque that B can support to the maximum torque that A can support is ________ (rounded off to two decimal places).
