Abstract: A CMOS data clearing circuit is provided. The CMOS data clearing circuit is configured to clear CMOS data of a main board of an electronic device. The electronic device includes a control chip and a pin header. The CMOS data clearing circuit includes a controller and a connection port. The controller generates a pulse signal and an operation signal. The connection port has an input pin and an output pin. The output pin is coupled to a first pin of the pin header. The connection port connects the input pin to the output pin in response to the operation signal, so as to transmit the pulse signal to the first pin of the pin header via the output pin. The control chip clears the CMOS data of the main board according to the pulse signal received by the first pin.

Abstract: A ball cage for ball bearing includes a first race, a second race, a plurality of first ribs equiangularly arranged on the first race with a first curved groove defined between each two adjacent first ribs, and a plurality of second ribs equiangularly arranged on the second race with a second curved groove defined between each two adjacent second ribs. The first ribs are respectively and partially stacked on the second ribs so that each first curved groove is combined with one respective second curved groove to create a respective ball accommodation chamber. Thus, the ball cage can be commonly used for ball bearings lubricated with grease or oil gas to increase the convenience of use.

Abstract: A syringe is provided. A front end of a barrel has an annular blocking portion which has at least two projections and at least two engaging slots defined by the projections, and one side of each projection has a guiding face. A connector which has at least two blocking members arranged circumferentially is assembled to the front end of the barrel, and one side of each blocking member has an incline. The blocking members are respectively received in the engaging slots and blocked by the projections. A plunger is movably received in the barrel, wherein a front end thereof is movable and abuttable correspondingly against the bottom of the connector, and the front end of the plunger is connected with the bottom of the connector.