吊臂的主体是抗拉强度为750Mpa的无缝钢管,在主体下端焊有与中部转座相连的绞链套,上端焊有滑轮夹板并装配有起吊滑轮。
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为减少对主扒杆的弯曲作用,延长主扒杆的寿命,两吊臂应尽量避免同时吊荷。
旋转扒杆的吊臂在垂直面内上下最大旋转范围为180°。
What management roles would Jeff Bourk be playing as he (a) negotiates new contracts with potential airlines, (b) works with the airport employees in providing a high level of customer service to arriving and departing passengers, and (c) resolves the contractual issues with the city of Branson? Be specific and explain your choices.