A modular back pack, assault pack and ammunition carrier system allowing military personnel to collectively carry the weapon ammunition, personal sheltering materials, food and clothes and to rapidly release unnecessary weight when engaging in warfare. The catalyst may have high catalytic activity, inhibit catalyst poisoning caused by creepage and evaporation of a liquid molten carbonate electrolyte, maintain high reaction activity for a long time, provide high methane conversion, and allow production of synthetic gas having a high proportion of hydrogen. A pair of positioning rods each has an elliptic eccentrically integrated at lower end engaged into the positioning plate for rotatably operated the expanding plates to lock or unlock the positioning plates to achieve a non-step gripping a cutting lumber on the rectangular board. Furthermore, the present invention further provides a procedure of detecting a communication time. Output sides of each of the clutch systems drive an associated one of a pair of non-coaxial layshafts. An integrity protection controller is provided for observing one or more system parameters of a storage system and one or more hash tree parameters of the hash trees, and for updating a hash tree in dependence on the storage system parameter and the hash tree parameter.