... three roll rubber calender 三辊筒橡胶压延机 three roller bit 三牙轮钻头 three separate set 三件套的套装 ...
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three-roller bit 三牙轮钻头
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In this paper, on the basis of the results obtained from the bench and field tests of the three roller bit, its improving direction is approached.
本文以三牙轮钻头的台架试验和油气田现场试验的效果为依据，探讨三牙轮钻头的改进方向。
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