Abstract: A method for marking a slide file includes the following steps. Generating at least two reference spots on the slide file displayed by a display at preset reference coordinates of a displayed slide file. Obtaining an image of the slide file projected on a projection screen. Identifying the reference spots in the image and determining a standard coordinate of each reference spot in the image. Obtaining an association between the standard coordinates in the image and the preset reference coordinates in the displayed slide file. Obtaining a variety of images of the projected slide file. Identifying a bright spot in each image and determining its coordinate in each image. Calculating a coordinate of each bright spot in the displayed slide file according to the its determined coordinate in the image and the obtained association. Generating a continuous mark on the displayed slide file along the calculated coordinates.

Abstract: A clamping apparatus includes a seat, a first guiding sleeve, a second guiding sleeve, a handle element and a clamping element. The seat includes a support portion and legs integrally formed together. The first guiding sleeve and the second guiding sleeve are mounted at opposite sides of the support portion. The handle element is slidably engaged in the first guiding sleeve and the second guiding sleeve. The clamping element is pivotally connected to one end of the handle element and is received in the second guiding sleeve in a closed position. When the handle element is slid along the seat, the first guiding sleeve and the second guiding sleeve, the clamping element moves out of the second guiding sleeve in an open position; when the handle element is released, the clamping element and the handle element automatically return to the closed position.

Abstract: A test device includes a load module, an input module, an output module, a switching module, and a control module. The load module includes a light electrical load and a heavy electrical load. The input module includes at least one input connector switchably connected to the light load and the heavy load. The output module includes at least one output connector switchably connected to one of the at least one input connector. The switching module is configured to switch a connection between the input connector and the load module, and the connection between the at least one output connector and the at least one input connector. The control module is configured to control the switching module to switch the connections.

Abstract: In a method for identifying components of a printed circuit board (PCB) using a computing device, the computing device connects to a digital scanner and a display device. The digital scanner scans a PCB to generate a PCB file. The method selects one or more location points from the PCB, locates a coordinate point for each location point according to the PCB file, and builds a coordinate relationship between each location point and the coordinate point. The method converts the PCB file into a PCB image using a visual graphic tool, searches a test point on the PCB image according to a name of a component of the PCB, identifies the component on the PCB according to the test point, and obtains a coordinate value of the component according to the coordinate relationship. The display device displays the name and the coordinate value of the component for users.