源数据的字段规格是什么(字段名、类型、数据长度)？
What are the field specifications of the source data (field name, type, data length)?
反射波据此就可以用来确定线缆的长度和规格。
The reflection can thus be used to determine the length and gauge of the wire.
反射波据此就可以用来确定线缆的长度和规格。
The reflection can thus be used to determine the length and gauge of the wire.
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