在验证机械能守恒定律的实验中,与纸带相连的质量为1kg的重锤自由下落,打出的纸带

题型:实验题

问题:

在验证机械能守恒定律的实验中,与纸带相连的质量为1kg的重锤自由下落,打出的纸带如图所示,相邻记数点时间间隔为0.02s,g取9.8m/s2.求:

小题1:某同学根据纸带上的O点到B点的数据,计算出物体的动能增加量△Ek=0.47J,重力势能减小量△Ep=0.48J,经过多次实验均发现△Ek略小于△Ep,试分析原因:                                                             

考点:实验:探究弹力与弹簧伸长的关系实验:探究小车速度随时间变化的规律实验:探究加速度与力、质量的关系实验:探究功与速度变化的关系
题型:实验题

JT-C系列机车信号主要由哪些部分组成?简述各部分主要作用?

题型:实验题

People are indulging in an illusion whenever they find themselves explaining at a cocktail (鸡尾酒) party, say, that the are "in computers", or " in telecommunications", or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between us, they usually aren’t. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are (121) of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working group (紧密联系在一起的工作小组), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions.
The main reason we tend to focus on the (122) rather than the human side of work is not because it’s more (123) , but because it’s easier to do. Getting the new disk drive installed is positively trivial compared to figurine out why Horace is in a blue funk (恐惧) or why Susan is dissatisfied with the company aver only a few months. Human interactions are complicated and never very crisp (干脆的,干净利落的) and clean in their effects, but they matter more than any other aspect of the work.
If you find yourself concentrating on the (124) rather than the (125) . you’re like the vaudeville character (杂耍人物) who loses his Keys on a dark street and looks for them on the adjacent street because, as he explains, "The light is better there!\

A.technology

B.sociology

C.physiology

D.astronomy

题型:实验题

企业具有( )等特征。

A.经济性

B.社会性

C.独立性

D.公益性

E.盈利性

题型:实验题

经确认需紧急处理的自助设备长短款,经()批准,立即进行清机对账,按长短款交易相关规定进行处理并告知客户。

A.运营主管

B.设备管理员

C.大堂经理

D.网点负责人

题型:实验题

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