Abstract: The present application provides a method, apparatus, device and medium for virtual interaction, wherein the method includes: presenting a media content stream in a virtual space, wherein the media content stream includes at least one interactive object; switching a current camera position to a target camera position according to interactive indication information; presenting an interactive trigger zone and the interactive object in interactive space of the target camera position; and interacting with the interactive object according to the interactive trigger zone. The present application makes interactive operations of the user in the virtual space more vivid and rich, and thus enhances interactivity of the user in the virtual space and improves interactive quality of the virtual interaction.

Abstract: A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Abstract: A whiteboard includes a whiteboard support and a board body, the whiteboard support includes two support rods arranged in parallel with each other, and each of them is formed by rigidly connecting the first tube body and the second tube body, can be detached one by one, and then stored. Compared with the one-piece support rod of the conventional whiteboard, the whiteboard according to the present embodiment greatly reduces the occupied area and reduces the difficulty in transportation, and the transportation cost for the enterprise. Meanwhile, by providing at least two insertion slots at different heights on the side of the support rod facing the board body, the board body of the whiteboard can be adjusted in height so as to adapt to use of people of different heights.

Abstract: A whiteboard includes a whiteboard support and a board body, the whiteboard support includes two support rods arranged in parallel with each other, and each of them is formed by rigidly connecting the first tube body and the second tube body, can be detached one by one, and then stored. Compared with the one-piece support rod of the conventional whiteboard, the whiteboard according to the present embodiment greatly reduces the occupied area and reduces the difficulty in transportation, and the transportation cost for the enterprise. Meanwhile, by providing at least two insertion slots at different heights on the side of the support rod facing the board body, the board body of the whiteboard can be adjusted in height so as to adapt to use of people of different heights.