来源：央视网 | 2022-02-11 07:45:06 |
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天津北方网讯：近日，我国深水犁式挖沟机海试作业取得成功。该机是世界最强的犁式挖沟机之一，最大作业水深500米，挖沟最大深度可达2.5米……
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