Although not obtain the knowledge's sufficient conditions, but JTB model can still be saved as a set of necessary conditions.
尽管没有解决“知识”的充分条件问题,但仍然可以将JTB模型作为必要条件保留下来。
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In addition to JTB series Roots blower, our company also produces and sales low-noise DT tank centrifugal fan, T35/BT35, T30 axial fans, CF more airfoil centrifugal fan and axle roof ventilator.