特别是对于超细低钴硬质合金，WC晶粒将通过烧结颈产生异常长大。

Especially for superfine cemented carbide with low cobalt, crystalline grain unusually grows up through WC neck.

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半圆头低方颈螺栓。

Round head low square neck carriage bolts.

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结果：颈性眩晕血流动力学可分为4型：高流型(27%)、正流型(22%)、低流型(48%)、血流信号消失型(2%)。

RESULTS: Hemodynamics of CV could be divided into 4 types: high velocity type (27%), normal velocity type (22%), low velocity type (48%) and blood flow signal absence (2%).

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