Main products are drill and screw, which almost cover all the sizes and configurations.
主要产品是钻头和螺杆，我们提供几乎所有型号和结构。
In addition, some references and Suggestions on choosing design parameters of screw drill press concrete stake in complex foundation have been provided in this research.
另外，本次研究对复合地基中螺旋钻孔压灌混凝土桩的设计参数的选取提供了参考和建议。
The ground test replacement screw drill.
地面测试更换螺杆钻。
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