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急冷油循环泵的机械密封频繁泄漏是困扰乙烯生产的老难题。
Frequent leakage of mechanical seal of quenching oil circulating pump was a hard problem in ethylene production.
youdao
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急冷油循环泵的机械密封频繁泄漏是困扰乙烯生产的老难题。
Frequent leakage of mechanical seal of quenching oil circulating pump was a hard problem in ethylene production.
youdao