A computer device includes a chassis, a rail disposed in the chassis, an electronic module slidably disposed on the rail, a cable set connected to the electronic device and a cable arranging module. The buffer sheet comprises a substrate, and surface grains protruding from the substrate; the buffer sheet comprises adsorption zones, and non-adsorption zones; the surface grains of the adsorption zones are of a close pore structure, and the surface grains of the non-adsorption zones are partially or fully of an open pore structure for avoiding generating negative pressure. The variation in pressure of the fluid is suppressed within a predetermined range by a servo-driven pump. The example method also includes selecting advocacy material based on the location and the advocate.