A cleaning nozzle includes a mixing portion with inner walls thereof formed of quartz given smoothing treatment. The invention relates to the seeds of soybean cultivar 306924721, to the plants of soybean 306924721, to plant parts of soybean cultivar 306924721 and to methods for producing a soybean plant produced by crossing soybean cultivar 306924721 with itself or with another soybean variety. It has been found that use of the device of the invention can reduce or prevent the production of creasing and irregularity at the margins, i. Then, the first bonding object is placed on a second bonding object having a second electrode portion in a manner such that the metal paste filled in the opening faces the second electrode portion while the resin coating contacts the second bonding object. The access of the components to the cache memory is controlled by the first mask values.