题目

阅读理解 Here's advice on where to find job applications.Company Websites If you are interested in working for a particular company, visit their website. Career information is usually listed in the “Careers” or the “About Us”section of the site. Often, you will be able to apply for all company positions directly from the website.Job Boards and Engines If you aren't sure what company you want to work for, you can look for job applications on job boards and job search engines. These contain job listings for positions at many different companies. Sometimes you have to go to the compan在“探究哪些因素影响滑轮组的机械效率”的实验中，某小组利用如图所示装置测得了四组数据，如下表所示．试验次数钩码重G/N钩码上升的高度h/cm测力计的示数F/N测力计移动的距离s/cm1321.262351.2153381.22643101.230（1）前三次实验中，第_______次实验数据明显出现错误，应当剔除．（2）第四次实验中，有用功是______J，总功是______J，滑轮组的机械效率为______．（3）根据以上信息，请判断：该小组设计这四次实验的目的是为了探究滑轮组的机械效率与______是否有关．（4）该小组观察并分析实验后，认为实验中，可少用一种器材，少测两个数据也能测出滑轮组的机械效率，请你分析一下，去掉的器材是什么？少测哪两个数据？答：去掉______；少测两个数据是______，______．