Abstract: A method for screening tobacco resistance against root-knot nematode based on intensive seedling production is provided. The method has two biological properties: inducing and stimulating the hatching of nematode eggs by host root exudates, and easily infecting the root cap elongation zone by hatched second-instar larvae. The second-instar larvae hatched by the root-knot nematode eggs are continuously inoculated. After that, under cultivating the infected tobacco seedlings in shallow water infiltrating and humidifying substrate, the created temperature, humidity and air permeability conditions are suitable for disease induction. After disease investigation, disease index is calculated, and the resistance of tested cultivars is evaluated according to the disease index. The method features simple operation, high selection efficiency, and high accuracy and reproducibility.

Abstract: An electrochemical apparatus, including a housing, an electrode assembly, a first tab, a first connecting member, a second tab, and a second connecting member. The housing includes a top wall, a side wall, and a bottom wall, the top wall being provided with a first electrode. The electrode assembly includes a first electrode plate and a second electrode plate. The first tab is connected to the first electrode plate and the first electrode, and the first connecting member is connected to the first electrode. The second tab is connected to the second electrode plate and the housing, and the second connecting member is connected to the housing. When the electrochemical apparatus is in a charging/discharging state, a magnetic field generated by the electrochemical apparatus is weakened, reducing electromagnetic interference of the electrochemical apparatus to an electric device.

Abstract: An electrochemical apparatus, including a housing, an electrode assembly accommodated in the housing, a first tab, and a second tab. The housing includes a top wall, a side wall, and a bottom wall, where the top wall is provided with a first electrode. The electrode assembly includes a first electrode plate and a second electrode plate. The first tab is connected to the first electrode plate and the first electrode. The second tab is connected to the second electrode plate. When viewed in a direction perpendicular to the top wall, an angle between a length direction of the first tab and a length direction of the second tab is denoted as ?, satisfying: 0°???60°. When the electrochemical apparatus is in a charging/discharging state, a magnetic field generated by the electrochemical apparatus can be weakened.

Abstract: An electrochemical apparatus, including a winding-structured electrode assembly, an end of a first electrode plate is provided with a first zone connected to a first tab, an end of a second electrode plate is provided with a second zone connected to a second tab. Along a winding direction from inside to outside, the first electrode plate is located on the inner side of the electrode assembly relative to the second electrode plate, and the first zone exceeds the second zone by a winding length of less than one turn. An angle between a half line from a winding center to a center of the first zone and a half line from the winding center to a center of the second zone is ?, 30°???270°. An effective current path length of the outermost turn of the first electrode plate is extended, thereby reducing a magnetic field produced by the electrode assembly.