矿井设备 pit gear 油井设备 oil derrick; oil rig ..
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PIT-HEAD WINDING GEAR 矿井口卷扬装置
pit gear
坑齿轮
以上为机器翻译结果,长、整句建议使用 人工翻译 。
There are the various damages on the gear surfaces of triplex pumps made in China, especially, there exist a lot of phenomena of the pit corrosion.
国产三缸泵的齿轮齿面损伤严重,尤其以点蚀现象居多。
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