Abstract: An amphibious vehicle with liftable suspensions includes a vehicle body. A driving assembly, a front axle transmission assembly, and a rear axle transmission assembly are disposed in the vehicle body. The front axle transmission assembly and the rear axle transmission assembly are respectively arranged on two ends of the drive assembly, and the drive assembly is in transmission connection with the front axle transmission assembly and the rear axle transmission assembly. The drive assembly enables the front axle transmission assembly and the rear axle transmission assembly to drive the front axle transmission shaft components and the first rear axle transmission shafts, thereby to achieve four-wheel travelling on land. Additionally, the amphibious vehicle can adjust heights of the vehicle body according to different road conditions using air springs and worm wheels, thereby adjusting a ground clearance to adjust various road surfaces and speeds.

Abstract: A time synchronization method and apparatus for network devices and a time synchronization server are disclosed, which relates to the field of communication technology, to solve the problem of failing to perform high-capacity and centralized time synchronization due to less timely processing of a time synchronization message in the related art. The method includes: a programmable logic device receiving and parsing a time synchronization message from a to-be-synchronized device in a physical layer, wherein the time synchronization message carries a synchronization parameter; the programmable logic device generating a reply message for the time synchronization message according to local reference time and update configurations of the synchronization parameter; and the programmable logic device sending the reply message and a link establishment and communication message from a CPU to the to-be-synchronized device in a preset order.