球墨铸铁管的热处理一般分为加热、保温、()、缓冷四个阶段。...
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Wednesday, July 26, 2023
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Monday, September 12, 2022
DN200球化管的出铁温度为()。A、1480~1500℃B、1490~1510℃C、1510~1530℃D、1530℃以上...
Sunday, August 13, 2023
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Monday, September 12, 2022
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屈服强度用符号()表示。A、σbB、σ0.2C、σsD、σe...
Saturday, April 27, 2024
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Monday, September 12, 2022
球铁管承插口密封工作面不得有连续的()沟纹。A、轴向B、径向C、任意方向D、以上都对...
Wednesday, July 26, 2023