...cal seal ; sillicon carbide mechanical seal ; Mechanical Shaft Seals 抛物面天线机械轴 Machine axis of parabolic antenna 矽碳钢机械轴封 sillicon carbide mechanical seal ..
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... 抛物面天线反射器 parabolic dish 抛物面天线坏轴 machine axis of parabolic antenna 抛物面天线几何轴 geometrical axis of parabolic antenna ...
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