Abstract: A uracil compound containing a carboxylate fragment, a preparation method therefor, and a herbicidal composition and use thereof are provided. The preparation method includes a contact reaction between a carboxylic acid compound and different substituted alcohol, halogenated, or sulfonate compound in a presence of a solvent. The uracil compound containing a carboxylate fragment provided by the present invention has better herbicidal activity compared with the prior art.

Abstract: A sliding sleeve device has an outer cylinder, a circulation hole being provided in the wall of the outer cylinder; and an inner cylinder provided in an inner cavity of the outer cylinder. In an initial state, the inner cylinder and the outer cylinder are fixed to each other to seal the circulation hole. In a first state, the inner cylinder is movable relative to the outer cylinder, thereby unsealing the circulation hole. A protection mechanism is provided in the circulation hole, which has an inner member located on the radially inner side and an outer member located on the radially outer side.

Abstract: The freshness of one or more terms in a documentation, indicative of a currency of the one or more terms is computed. Each term includes one or more constituent words, and the terms are visually marked as current or out-of-date based on the computed freshness. Upon marking a term as out-of-date, a latest term for the out-of-date term is retrieved or a most possible latest term for the out-of-date term is predicted.

Abstract: A monitoring method for an electronic device configured with an embedded flash memory. The monitoring method includes: acquiring service life data and access status data of the embedded flash memory; performing statistics on the access status data to obtain a statistical result of the access status; generating early warning information if it is determined according to the service life data and/or the access status data that an early warning condition is met; and reporting and displaying the service life data and the statistical result of the access status according to the early warning information. Through real-time monitoring on an electronic device with an embedded flash memory module, when the service life loss of the embedded flash memory reaches a preset range or the usage status of the embedded flash memory reaches a preset condition, a user can be warned and provided with a viewing interface.