搔熊者必具铁爪；要干危险的事，就得有充分的准备。
木材抓具的抓爪，在不利工况下的危险截面是位于撑杆与抓爪联结爪耳处的内缘，该处所受应力最大。
Under unfavourable work conditions a dangerous section forms on the inner wing of the joint between sprag and grip, where the stresses are concentrated.
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.
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