Abstract: The present invention provides a novel coronavirus duplex detection kit. Specifically, the present invention discloses a kit and method for multiplex detection of novel coronavirus 2019-nCoV nucleic acid, which can simultaneously detect two nucleic acid targets of the novel coronavirus 2019-nCoV and possess extremely high sensitivity and specificity, and significantly improve the accuracy of virus identification.

Abstract: Provided is a nucleic acid detection kit for novel coronavirus 2019-nCoV, and in particular, provided are a kit and a method for multiple detection of the nucleic acid of the novel coronavirus 2019-nCoV. Three nucleic acid targets of the novel coronavirus 2019-nCoV can be detected at the same time. False positives can be prevented by means of mutual authentication among different targets, and detection omissions, which may be caused by mutations, are confirmed, such that the accuracy of virus identification is significantly improved.

Abstract: The utility model discloses a bone conduction speaker composed of double magnetic fields, which comprises a mechanical conductive sheet, a conduction shell, an outer housing, a coil and a magnetic assembly, wherein the conduction shell comprises a bottom plate and a side wall, and the magnetic assembly comprises a first magnet, a magnetic conductive sheet and a second magnet; the side wall of the conduction shell surrounds the first magnet, the magnetic conductive sheet and the second magnet; and the coil is arranged in a magnetic gap formed between the side wall of the conduction shell and the magnetic assembly. The second magnet can inhibit leakage of magnetic induction field generated by the first magnet, restrain the form of magnetic induction lines passing through the coil, make more of the magnetic induction field pass through the coil as horizontally and densely as possible, and enhance the magnetic induction sensitivity at the coil position.

Abstract: The present invention provides a novel coronavirus duplex detection kit. Specifically, the present invention discloses a kit and method for multiplex detection of novel coronavirus 2019-nCoV nucleic acid, which can simultaneously detect two nucleic acid targets of the novel coronavirus 2019-nCoV and possess extremely high sensitivity and specificity, and significantly improve the accuracy of virus identification.

Abstract: The utility model discloses a bone conduction speaker composed of double magnetic fields, which comprises a mechanical conductive sheet, a conduction shell, an outer housing, a coil and a magnetic assembly, wherein the conduction shell comprises a bottom plate and a side wall, and the magnetic assembly comprises a first magnet, a magnetic conductive sheet and a second magnet; the side wall of the conduction shell surrounds the first magnet, the magnetic conductive sheet and the second magnet; and the coil is arranged in a magnetic gap formed between the side wall of the conduction shell and the magnetic assembly. The second magnet can inhibit leakage of magnetic induction field generated by the first magnet, restrain the form of magnetic induction lines passing through the coil, make more of the magnetic induction field pass through the coil as horizontally and densely as possible, and enhance the magnetic induction sensitivity at the coil position.