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The sliding sight on a surveyor's leveling rod .
标板：勘测水准标尺上的滑动观测器。
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The formed split end and tail cracking of wire rod during rolling are a common sight.
线材轧制过程中轧件出现劈头与尾裂是常见现象。
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The formed split end and tail cracking of wire rod during rolling are a common sight.
线材轧制过程中轧件出现劈头与尾裂是常见现象。
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