一种跌落试验机台，包括一支架、一具可上下伸缩的芯杆的气缸、一气爪及一控制电路 。
The invention discloses a dropping tester table, which comprises a support, a cylinder with an up-down telescopic core bar, an air claw and a control circuit.
全面解决支护和冒放等难题，关键在于开发和采用由上述两项新技术结合而成的新型放顶煤液压支架-伸缩杆尾梁放顶煤液压支架。
The key of settling the difficulties of supporting and caving is to develop and adopt the new style hydraulic caving supports with tail beam of expansion link combined by above 2 new technologies.
一种自行车遮阳篷伞，由支架、篷架、篷面组成，其特征在于：支架包括卡头、主杆和伸缩杆；
The utility model relates to an awning umbrella for bicycles, which is composed of a bracket, an awning frame, and an awning surface.
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