预制安装水池壁板吊装前,壁板侧面应全面()并清除松动石子等物。A.磨平 B.凿毛 C

题型:单项选择题

问题:

预制安装水池壁板吊装前,壁板侧面应全面()并清除松动石子等物。

A.磨平

B.凿毛

C.湿润

D.冲洗

考点:市政公用工程1K414020给水排水厂站工程施工1K414020给水排水厂站工程施工题库
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在线调查进入门槛低,信息发布自由度和开放度很高,具有跟帖评论、推荐阅读、RSS订阅等的互动功能。

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如图所示,一个水平放置的圆桶绕水平轴O1O2匀速转动,桶的半径R=2m,桶壁很薄,壁上有一小圆孔P,当圆孔运动到桶的正上方时,在孔的正上方h=3.2m处有一个小球由静止开始下落,已知圆孔的半径略大于小球的半径.试求:要使小球在整个下落过程中都不与桶壁碰撞,圆桶转动的角速度的所有可能值.

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Some pioneering work that began as an attempt to discover ways to increase production efficiency led to the founding of the human relations movement in industry and to the development of motivational skills and tools for managers. In 1927 researchers were involved in determining the optimum amount of lighting, temperature, and humidity (with lighting being considered the most important) for the assembly of electronic components at Western Electric. The researchers found that lighting had no consistent effect on production. In fact, production sometimes increased when lighting was reduced to the level of ordinary moonlight! The important part of this experiment began when two Harvard researchers, Elton Mayo and Fritz Roethlisberger, were brought in to investigate these unexpected results further. They found that workers were responding not to the level of lighting but to the fact that they were being observed by the experimenters.
This phenomenon came to be known as the Hawthorne effect since the experiments were conducted at the Western Electric Hawthorne Plant. This was the first documented and widely published evidence of the psychological effects on doing work, and it led to the first serious effort aimed at examining psychological and social factors in the workplace. Further experiments were continued for five years. Generally, the researchers concluded from their experiments that economic motivation (pay) was not the sole source of productivity and, in some cases, not even the most important source. Through interviews and test results, the researchers focused on the effects of work attitudes, supervision, and the peer group and other social forces, on productivity.
Their findings laid the groundwork for modem motivation theory, and the study of human factors on the job, which continues to this day in such common practices as selection and training, establishing favorable work conditions, counseling, and personnel operations. The contributions of this experiment shifted the focus of human motivation from economics to a multifaceted approach including psychological and social forces.

The most significant finding of the original research was ______.

A.lighting had no consistent effect on production

B.production sometimes increased when lighting was reduced to the level of ordinary moonlight

C.that lighting was no more important than the other factors of temperature and humidity

D.the results were unexpected and confusing

题型:单项选择题

对预抽煤层瓦斯区域防突措施进行检验时,煤层残余瓦斯压力小于0.74MPa或残余瓦斯含量小于()的预抽区域为无突出危险区。否则,即为突出危险区,预抽防突效果无效。

A、10m3/t

B、8m3/t

C、5m3/t

D、7m3/t

题型:单项选择题

发电机入口风温升高时,将对发电机产生什么影响?

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