| http://www.w3.org/ns/prov#value | - Referring to FIG. 2, an excitation device 4 is a functional block which applies a direct-current or alternating-current exciting magnetic field to a region 3 constituting the object of measurement, in which the magnetic fluid 2 possessing paramagnetism has been injected from the outside into the substance 1 (living-body tissue) in which a fluid can flow.
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