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The present application belongs to the technical field of water storage and waterway system, and particularly relates to a motor home and a hot water system thereof. In order to solve the problems of non-continuous hot water supply and slow heating speed of the existing hot water system of the motor home, the present application generates hot water by any one of the heating modes of heating through a heat exchange device, heating through a heat preservation water storage device and heating through an electric heating device when the vehicle is started, and generates hot water by heating through the electric heating device when the vehicle is not started. The present application can generate hot water fast and continuously in any state of the motor home.

This invention provides a cobalamin derivative, its preparation method, and its application in the synthesis of arsenopyrine, relating to the field of heterocyclic compounds, and more specifically to the field of arsenopyrine synthesis technology. This cobalamin derivative is prepared by linking a 3-amino-3-carboxypropyl (ACP) group to the cobalt atom of cobalamin (CbI), and protecting the 3-amino-3-carboxypropyl group with a 9-fluorenemethoxycarbonyl (Fmoc) and a tert-butyl (tBu) group.

The application discloses a resistance detection device, a resistance detection system, an electric table and an electric hanging cabinet, belongs to the field of resistance detection, has high resistance detection sensitivity, and discloses the resistance detection device, which comprises a first shell and a second shell, the second shell is floatingly installed on the first shell through a first elastic element, a circuit board is arranged on the first shell, a resistance detection switch connected with the circuit board and a rotating knob are arranged on the first shell, one end of the rotating knob is a free end abutting against the first shell, the other end of the rotating knob is a pressing end for pressing the resistance detection switch, and the free end is driven to drive the pressing end to move away from the resistance detection switch to generate a resistance signal.