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　　　　Some information related to process scheduling and process -related information is also stored in PCB.　　(1) Process statu

　　　　① Natural execution: scheduling　　② Execution Waiting: Waiting for an event to sleep and sleep　　③ Waiting Reading: Wake

　　　　Each process must have a unique identifier, which can be a string or a number. In the Unix system is an integer number. T

　　　　1. Program ID (PID, process handle): It is the only one, and a process must correspond to a PID. PID is generally plastic

　　　　Most single, double-sided, and multi-layer PCB circuit boards are made of FR-4. The FR in FR-4 represents flame retardant

　　　　PCB is an abbreviation for Printed Circuit Board in English, also known as Printed Circuit Board or Printed Circuit Board