Abstract: A work tool and transmission system thereof. The transmission system comprises: a first shaft (250) and a second shaft (350), a near end (351) of the second shaft having a first mating part; a shaft coupler (600), a far-side part (620) of the shaft coupler having a second mating part matched in shape to the first mating part; and a coupling mechanism capable of directly or indirectly applying a coupling force to at least one of the first shaft, the second shaft and the shaft coupler; when the far-side part of the shaft coupler is aligned with the near end of the second shaft in the circumferential direction, the coupling force forces the first mating part to engage with the second mating part, so that the shaft coupler transmits rotational movement of the first shaft to the second shaft. The work tool comprises: a transmission system; a motive power head transmission-connected to the first shaft (250); and a working head transmission-connected to the second shaft (350).

Abstract: Disclosed is a method and device for identifying an industry classification of an enterprise and characteristic pollutants of the enterprise, wherein the method for identifying an industry classification of an enterprise comprises: acquiring information point data of a target enterprise; determining feature words of the information point data and feature values of the feature words according to a preset semantic lexicon, preset industry summary information and the information point data; and determining the industry classification to which the target enterprise belongs according to a preset industry classification prediction model and the feature values. Through implementing the present invention, the obtained feature values can effectively avoid interference of meaningless words, such that the industry classification to which the target enterprise belongs obtained from identification is more accurate.