Please select the most similar patent number from A, B, C and D. Which number is?
A frequency conversion ultrasonic wine aging device for bottled wine comprises a base (1), and an opening portion formed by extending upwards along a peripheral edge of the base (2); a container is arranged in the opening portion and used for containing a sound conducting medium solution; when the frequency conversion ultrasonic wine aging device is used, a wine bottle (3) is placed in the container and immersed in the sound conducting medium solution; an ultrasonic transducer (21) and a control circuit board (23) are mounted in the base (2); the control circuit board (23) is provided thereon with an ultrasonic generating unit and an ultrasonic frequency modulation unit; the ultrasonic generating unit is used for converting a commercial power into an ultrasonic frequency alternating current signal; the ultrasonic frequency modulation unit serves to modulate the frequency of the ultrasonic frequency alternating current signal so that the frequency of the ultrasonic frequency alternating current signal varies cyclically within a set range; the frequency-modulated ultrasonic frequency alternating current signal is input into the ultrasonic transducer (21) to cause the ultrasonic transducer (21) to generate an ultrasonic wave; and the ultrasonic transducer (21) is used to transmit the ultrasonic wave into the container. The frequency conversion ultrasonic wine aging device can generate the best ultrasonic frequencies required for ripening and aging of various types of wines, and also realizes acceleration of a wine ripening process to achieve a quick aging effect.
A: An ultrasonic alcoholic beverage aging device, comprising an ultrasound generating unit, a containing unit, an alcoholic beverage holding unit, and an alcoholic beverage input and output operating unit. The ultrasound generating unit is used to generate a mechanical vibration. The mechanical vibration is transmitted to the alcoholic beverage holding unit via water in the containing unit so as to perform aging processing on an alcoholic beverage in the alcoholic beverage holding unit. The alcoholic beverage input and output operating unit is used to input the alcoholic beverage into the alcoholic beverage holding unit and output the liquid from the alcoholic beverage holding unit. The aging device is further provided with a control panel, and the control panel is provided with a alcoholic beverage input and output switch. When the alcoholic beverage input and output switch is in different positions, the alcoholic beverage input and output operating unit is controlled to perform an alcoholic beverage input or output operation.
B: Disclosed is a medical drug delivery device, comprising an ultrasonic generator (4) and a cavity body (1), wherein the cavity body (1) can be pressed closely against human skin and has a liquid permeation structure set in the side, and an ultrasonic transducer (2) is arranged inside the cavity body (1) with the ultrasonic transducer (2) being electrically connected to the ultrasonic generator (4) through a wire (3), and the cavity body (1) is in communication with a drug delivery tube (7) with a bleeder pipe being set in the cavity body (1), and the drug delivery tube (7) is connected to a liquid medicine storage pump (6). The ultrasonic transducer (2) is an ultrasonic piezoelectric ceramic piece, and the drug delivery device also comprises a controller (5) connected to a computer, and the liquid medicine storage pump (6) and ultrasonic generator (4) are controlled by the controller (5). A pressure testing probe (11), which is connected to the controller (5), is arranged in the liquid medicine after being outputted by the liquid medicine storage pump (6). The medical drug delivery device does not need to break the skin using a needle to perform drug delivery, causes no trauma, can reduce patients&#39; pain and chances of infection, and increases the drug sensitivity of human cells, thereby improving the therapeutic effects.
C: An ultrasonic soup cooker includes a body (10), an ultrasonic generator and an ultrasonic transducer (20) which is mounted in the body (10). The ultrasonic generator is coupled electrically to the ultrasonic transducer (20). The ultrasonic transducer (20) can change electric energy into ultrasonic vibration, and cause the excitation of water, so as to make the nutrition in food dissolved in the soup sufficiently.
D: An intelligent ultrasonic material level sensor, comprising an upper cover (11), a housing (1), a probe (31), and a circuit portion (2), wherein a fixed bracket (115) is provided in the housing (1), and the fixed bracket (115) is used to install the circuit portion (2); the circuit portion (2) is provided in the housing (1), and the circuit portion (2) comprises a power conversion module, an ultrasonic transducer unit (22), an ultrasonic driving circuit, an instrumentation amplifying circuit, a filtering and amplifying circuit, a gain adjusting module, a central processing unit and a temperature filtering circuit; the ultrasonic transducer unit (22) comprises a signal receiving and transmitting unit and a temperature detecting unit, and the ultrasonic transducer unit (22) is provided at an inner part of the probe (31). The present sensor is highly reliable and has precise detection accuracy, will not be affected by temperature, and has strong anti-interference capabilities; and sound speed learning may be achieved by means of a key learning mode.
Answer: A