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套管
为保障泥浆正常循环,防止井眼坍塌,以保证钻进过程正常进行,插入钻孔或井内用于支撑孔壁的钢管。
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philosophy of logic
Philosophy of Logical Atomism
Philosophy of Logics
philosophy of management
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Philosophy of Mind
philosophy of mind
Philosophy of Mythology and revelation
Philosophy of Nature
philosophy of nature
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Philostratos Flavius
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philtrum
phi meson
phimosis
pH indicator
Phineas T.Barnum
phi-number system
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