风机高位油箱的顶部设呼吸孔,防止当润滑油由高位油箱流入轴承时,形...
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离心鼓风机的性能曲线,是反映鼓风机性能参数之间()在曲线。...
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风机中的油封和气封往往是什么型式的密封,简述其工作原理。...
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强制润滑系统通常是由()、主油泵、辅助油泵、冷油器、滤油器、溢流阀、油压调节阀,管路辅件、压力表、事故油箱等组成。...
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炼钢生铁国家标准的含磷上限是()。A、0.25%B、0.30%C、0.40%D、0.45%...
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管道内的煤气浓度低于爆炸极限下限混合气体,可()。A、爆炸B、着火C、不会着火,但有可能发生人员中毒事故...
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