较小的双列角接触球轴承没有填充槽(图1.15 a和b)，使他们可以从双方的轴向加载。
Smaller double-row angular contact ball bearings do not have a filling slot (Figure 1.15a and b) so that they can be axially loaded from both sides.
一个单一的渐进式计量槽，摆脱双方的主要和校正飞机，以及文丘里。
A single progressive metering groove did away with both main and corrector jets, as well the Venturi.
注：试样尺寸和刻槽深度如有特殊要求时，应按相应的技术条件或双方协议的规定执行。
Note: in case of the special requirements, the sample size and notch-groove depth shall be executed according to the requirements of corresponding technical conditions or mutual agreements.
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