Abstract: A Y-shaped packer includes a supporting part, fixedly sleeved on the outer wall of the inner barrel; a plugging part having an inner end part connected with the outer wall of the supporting part, and an outer end part tilted upward so that an angle between the plugging part and the supporting part is an acute angle; an expansion seal connected with the supporting part. The expansion seal is located above the plugging part. The Y-shaped packer is arranged in an annular gap between an outer barrel and an inner barrel. Through the combination of the supporting part arranged obliquely and the expansion seal arranged above the supporting part, the invention-shaped packer can realize the effect of secondary sealing on the gap between the outer barrel and the inner barrel.

Abstract: A network standard switching method includes obtaining a network standard switching instruction including a target priority. The network standard switching instruction instructs a terminal device to be handed over to a target network whose standard is a target standard, and a priority of the target network is greater than a priority of a network in which the terminal device is currently located. The method further includes releasing a network link between the terminal device and a currently accessed first base station, intercepting and caching to-be-sent application-layer data of the terminal device, discarding a paging message in a packet switched (PS) domain received from a first-priority network to the terminal device, and handing over to the target network.

Abstract: A network standard switching method includes obtaining a network standard switching instruction including a target priority. The network standard switching instruction instructs a terminal device to be handed over to a target network whose standard is a target standard, and a priority of the target network is greater than a priority of a network in which the terminal device is currently located. The method further includes releasing a network link between the terminal device and a currently accessed first base station, intercepting and caching to-be-sent application-layer data of the terminal device, discarding a paging message in a packet switched (PS) domain received from a first-priority network to the terminal device, and handing over to the target network.