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Provided in the present invention is an antibody against human CD3 or an antigen-binding fragment thereof; also provided are a nucleic acid molecule encoding the antibody, an expression vector expressing the antibody and a host cell, as well as a method for producing the antibody. In addition, also provided in the present invention are a pharmaceutical composition comprising the antibody or the antigen-binding fragment thereof, a use thereof in the preparation of a drug, and a use of the drug as a drug for the prevention and / or treatment of various diseases, including tumors, organ transplantation and autoimmune diseases.

A single-crystal-type multi-element positive electrode material, and a preparation method therefor and an application thereof. The positive electrode material satisfies the following conditions: single crystal sizes DPS90, DPS10 and DPS50 of the positive electrode material, which are measured by means of SEM, satisfying the following relationship: 0.1≤B90=(DPS90-DPS10) / DPS50≤1.5; and the agglomeration rate of the positive electrode material being less than or equal to 20%, wherein DPS90 represents that 90% of the single crystal size of the positive electrode material is less than DPS90, DPS50 represents that 50% of the single crystal size of the positive electrode material is less than DPS50, and DPS10 represents that 10% of the single crystal size of the positive electrode material is less than DPS10. The single-crystal-type multi-element positive electrode material has rounded morphology, a uniform particle size, less agglomeration, less adhesion, a high compaction density and a good structural stability, and when same is applied to a lithium ion battery, the energy density, rate capability, cyclic stability and safety of the lithium ion battery can be improved.

A sound output device includes an acquisition unit, an ear speaker, and a sound controller. The acquisition unit acquires data of an information sound providing an operator with information. The ear speaker outputs the information sound such that sound pressure of the information sound at a position of an ear of the operator is higher than sound pressure at positions other than the position of the ear. The sound controller controls the ear speaker to emphasize the information sound more when the information sound indicates a high degree of necessity for the operator to take action against the information sound than when the information sound indicates a low degree of the necessity.