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Handle (Handle or Descriptor, referred to as Handle under Windows and Descriptor under Linux): Essentially represents a resource (such as file descriptor or socket descriptor for network programming) provided by the operating system; This resource is used to represent events one by one, which can come from both the outside and the inside. External events such as the client's connection request, the data sent by the client, etc.; Internal events such as timing events generated by the operating system. It is essentially a file descriptor, and Handle is the birthplace of events.(2) Detection of control coil. The detection of the control coil of the time relay is shown in the following figure.要说这章写得怎么样，当然是好，笔力雄浑有力，描述细致入微，人物刻画得栩栩如生，让人身临其境。Light tube shot in automatic mode可不管咋闹。一个一事无成的农民，在国家存亡的关键时刻挺身而出，他要以一己之力保卫家国。不过晕乎乎的他能成么？破杭州而不踞，望苏松而不进，擒官眷，放百姓，出师皆汉人，刀刃不沾血。