... Lead cam 导程凸轮 Lead screen 铅屏 ; 铅屏蔽 ; 铅增感屏 ; 铅防护屏sounding lead 测深锤 ; 测铅 ; 测深铅锤 ...
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... Lead cam 导程凸轮 Lead screen 铅屏 ; 铅屏蔽 ; 铅增感屏 ; 铅防护屏sounding lead 测深锤 ; 测铅 ; 测深铅锤 ...
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... Lead cam 导程凸轮 Lead screen 铅屏 ; 铅屏蔽 ; 铅增感屏 ; 铅防护屏sounding lead 测深锤 ; 测铅 ; 测深铅锤 ...
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N a lead weight, usually conical and having a depression in the base for a dab of grease so that, when dropped to the bottom on a sounding line, a sample of sand, gravel, etc, can be retrieved 测深锤
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