Specify the record length as 80 and the key length as 5.
指定记录长度为80，键长度为5。
The length field for this volume record cannot be read.
无法读取这个卷记录的长度字段。
For example, an "undefined record" is a record of unspecified or unknown length.
例如，某条“未定义记录”就是一种未确定或不知道长度的记录。
The field contains the length of the record to which it is attached.
该字段含有其所属记录的长度。
Precision length counter is used to record fabric quantity;
配置精密计码器，准确记录布匹数量；
Precision length counter is used to record fabric quantity;
配置精密计码器，准确记录布匹数量；
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