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问题 多项选择题

根据《工程建设标准强制性条文》中的《建筑施工门式钢管脚手架安全技术规范》（JGJ128-2010），脚手架拆除作业必须符合下列规定（）。

A.架体的拆除应从上而下逐层进行，严禁上下同时作业

B.同一层的构配件和加固杆件必须按先上后下、先外后内的顺序进行拆除

C.连墙件必须随脚手架逐层拆除，严禁先将连墙件整层或数层拆除后再拆架体。拆除作业过程中，当架体的自由高度大于三步时，必须加设临时拉结

D.连接门架的剪刀撑等加固杆件必须在拆卸该门架时拆除

答案

参考答案：A, B, D

填空题

如图，用滑轮组提升一重物，物体质量为500g，钩码在4s内被匀速提升了2cm，已知弹簧测力计的拉力为2.5N，则提升重物的过程中，拉力F的平均功率为 W，滑轮组的机械效率为

      %。（g=9.8N/kg）
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问答题

Psychologists once believed that the motive that caused men to strive to attain high-level managerial positions was the "need for achievement". But now they believe it is the "need for power".
Power seekers strive hard to reach positions where they can exercise authority over large numbers of people. (46) Individual performers who lack this drive are not likely to advance far up the managerial ladder. They usually scorn company politics and devote their energies to other types of activities. The power game is part of management, and it is played best by those who enjoy it most.
(47) One of the least rational acts of business organizations is that of hiring managers who have a high need to exercise authority, and then teaching them that authoritative methods are wrong and that they should be consultative or participative. (48) It is a serious mistake to teach managers that they should adopt styles that are inconsistent with their unique personalities. Yet this is precisely what a large number of business organizations are doing; and it explains, in part, why their management development programs are not effective.
(49) What managerial aspirants should be taught is how to exercise their authority in a way that is appropriate to the situation and the people involved. They need to learn that the real source of their power is their own knowledge and skill, and the strength of their own personalities, not the authority conferred on them by their positions. When they lack the knowledge or skill required to perform the work, they need to know how to share their authority. (50) But when they know what has to be done and have the skill and personality to get it done, they must exercise their traditional authority in whatever way is necessary.
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