Abstract: A composition for preventing and treating bacterial leaf streak, and a preparation method therefor and an application thereof. The composition includes the following components in percentage by weight: 10-15 parts of dodecyl dimethyl benzyl ammonium bromide, 15-20 parts of copper sulfate pentahydrate, 20-25 parts of 84 disinfectant, and 40-55 parts of water. The composition is diluted and then may be used for rice seed soaking so as to prevent rice bacterial leaf streak, or is sprayed onto rice leaves so as to prevent and treat rice bacterial leaf streak. The application method of the composition is simple and convenient to operate, and solves the problem of the shortage of a prevention and treatment drug of rice bacterial leaf streak.

Abstract: An articulating digital endoscope or borescope which can be bent up to 180 degrees and has a small bending radius, simple structure, and can be operated with one hand. The front end of the bending part is connected to a digital camera, the rear end of the bending part is connected to the main body and the handle of the endoscope. The bending part comprises the upper and lower connecting segments, a number of joint plates and in-between discs connected in sequence. There are concave and convex structures on both sides of the joint plates so that the joint plates can fit to each other and be rotated. A mechanical shutter release cable is used to connect the bending part, the endoscope main body and the handle. When the shutter button is pressed, the inner spring of the shutter pushes forward to bend the bending part.

Abstract: An articulating digital endoscope or borescope which can be bent up to 180 degrees and has a small bending radius, simple structure, and can be operated with one hand. The front end of the bending part is connected to a digital camera, the rear end of the bending part is connected to the main body and the handle of the endoscope. The bending part comprises the upper and lower connecting segments, a number of joint plates and in-between discs connected in sequence. There are concave and convex structures on both sides of the joint plates so that the joint plates can fit to each other and be rotated. A mechanical shutter release cable is used to connect the bending part, the endoscope main body and the handle. When the shutter button is pressed, the inner spring of the shutter pushes forward to bend the bending part.