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Roadway heading is the forerunner for clearly knowing coal bed geological conditions.
掘进巷道是全面、准确了解矿井煤层地质条件的先导.
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Logic valves comprise cartridge elements and covers with pilot passages.
插装阀是由插装元件(插件)和带先导通路的阀盖组成的.
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Roadway heading is the forerunner for clearly knowing coal bed geological conditions.
掘进巷道是全面、准确了解矿井煤层地质条件的先导.
互联网摘选
Logic valves comprise cartridge elements and covers with pilot passages.
插装阀是由插装元件(插件)和带先导通路的阀盖组成的.
互联网摘选
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