倒链在使用过程中,应根据倒链起重能力的大小决定拉链的人数,当手拉链拉不动时,应增加人数拉拽。
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Using the four functions as your guide, what challenges would Jeff Bourk face in managing the Branson Airport?
Would you want to work for a company like this? Why or why not?
起重作业中,当轮槽壁磨损量达到原厚度的10%及径向磨损量达到绳直径的25%时,均要检修或更换滑轮。