Due to the special structure of controlled direction well, it can lead to severe abrasion even jamming if not adopting any measure when using progressing cavity pump rod to pump oil.
由于定向井井身结构特殊，利用螺杆泵进行抽油时如不采取任何措施势必造成杆柱严重磨损甚至卡死。
Described is the structure of the assist steering device applied on bolsterless bogies as well as the operation test results on the special test line of Japan's Railway Technical Research Institute.
介绍了无摇枕转向架上应用的辅助导向装置的结构，以及在日本铁道综合技术研究所专用试验线上的运行试验结果。
The synthesis method and the special structure, as well as the possible application of HOP in leather industry was also introduced.
介绍了超支化有机硅的合成方法，并根据其分子结构提出了这类聚合物在皮革化工领域可能的用途和前景。
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