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bit burnt
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bit burnt
烧钻
在钻进过程中,由于循环系统发生故障,在高速回转时产生高热,钻头与岩心、岩粉烧结在一起的事故。属孔内事故。
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valeric acid
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Valeriy Todorovskiy
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Valery Yakovlevich Bryusov
Valhalla Basin
Valiant
Valiant Prince
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Validation Study of the National College English Test
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