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This app provides a variety of practical calculation tools, including a space vector multiplication calculator, a Doppler radar calculator, a flow calculator, a molar mass calculator, and a power calculator. Users can easily calculate the dot product and cross product of space vectors, calculate Doppler frequency shift, pipeline flow, molar mass of matter, and electric power by entering the necessary parameters. These tools are very practical for applications in engineering, physics, and chemistry. The interface is simple and easy to operate. They are suitable for a variety of calculation needs and help users quickly solve daily calculation problems.