Abstract: The present invention discloses an electrically-driven power unit of a compact battery pack, which comprises a motor and a battery pack, wherein the motor is mounted on a base, the battery pack is supported on an upper part of the motor through a supporting frame, the supporting frame is shaped around the periphery of the motor, an arch-shaped supporting portion matched with the upper part of the motor is formed on an upper part of the supporting frame, a concave portion matched with the arch-shaped supporting portion is arranged at a bottom of the battery pack, and the arch-shaped supporting portion of the supporting frame is supported in the concave portion of the battery pack. The present invention can reduce the overall height of the electrically-driven power unit on the premise of not reducing the endurance of the battery pack so as to satisfy the overall mounting size limitation.

Abstract: The present invention discloses an electrically-driven power unit capable of replacing a fuel engine, which comprises a motor and a battery pack, wherein the motor is mounted on a base, the battery pack is supported on an upper part of the motor through a supporting frame, and one side of the motor is located below the battery pack to form an avoidance space. According to the present invention, the lower part of one side of the electrically-driven power unit is provided with the avoidance space similar to that of the traditional fuel engine, so that it is convenient to replace the small-sized fuel engine.

Abstract: The presently disclosed subject matter relates to a method for selecting a compound of haploid induction. The method includes: treating a reproductive tissue of a plant with a reagent containing compounds to be tested; detecting a reactive oxygen species (ROS) level in the reproductive tissue after the treatment; and determining a compound that leads to an increase of the ROS level as the compound.