双语例句
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Pump down time with heat
有钢水时的抽真空时间
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Pump down time with pre evacuation
预抽真空的抽真空时间
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The pump-down opening plug is used for continuous cementing operation and in deviated wells.
顶替型打开塞用于连续式双级注水泥作业，也适用与在斜井中使用。