TCP报头，它包含端口上的信息、隐含的协议、标记和顺序编号。
TCP header, which includes information on the port, implied protocol, flags and sequencing Numbers.
标记表示可用的消息字段编号。
The ticks indicate which message field Numbers are available.
焊工应配发唯一识别编号，该编号同时也将标记在附体试片上。在全部试验作业期间，均需保留标识。
The Welder shall be allocated a unique identification number which will be marked onto the test coupon. The identification will be maintained during all testing activities.
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