问题
填空题
弹簧测力计的原理是______，如果甲乙两个同学各用2N的力沿相反方向弹簧测力计，则弹簧测力计是数为______．
答案
弹簧测力计的原理是弹簧受到的拉力越大，伸长的就越长，同样用2N的力从两端拉弹簧测力计，与一端固定只拉另一端效果是相同的，根据力的作用的相互性，弹簧测力计是只可能显示一个2N．
故答案为：弹簧受到的拉力越大，伸长的就越长；2N．
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弹簧测力计的原理是______，如果甲乙两个同学各用2N的力沿相反方向弹簧测力计，则弹簧测力计是数为______．
弹簧测力计的原理是弹簧受到的拉力越大，伸长的就越长，同样用2N的力从两端拉弹簧测力计，与一端固定只拉另一端效果是相同的，根据力的作用的相互性，弹簧测力计是只可能显示一个2N．
故答案为：弹簧受到的拉力越大，伸长的就越长；2N．
Whenever I felt disappointed I often thought of what my mother had said to me，“Everything happens for the best.If you____，one day something good will happen.And you'll realize that it wouldn't have happened if not for that previous____．” As it____，mother was right.In 1932，I ended my college life.____ that，I had decided to try for a job in radio，and then could work my way up to sports ___．I went to Chicago and knocked on the door of every____－and got turned down every time.In one station，a ____ lady told me that big stations couldn't risk hiring a person who lacked ____．“Go to ____ town and find a little station that'll give you a chance，” she said.I then ____ to Dixon.While there was no radioannouncing jobs in Dixon，my father said Montgomery Ward had opened a store and wanted an athlete to ____ its sports department.Since Dixon was where I had played high school football，I ____．The job sounded just right for me.But I wasn't ____． My disappointment must have ___．“Everything happens for the best，” Mom ____ me.Dad ____ me one car for me to job hunt.I ____ WOC Radio in Davenport.The program ___，a wonderful Scotsman named Peter MacArthur，told me they had already ___ a contract with another announcer. I often ____ what direction my life might have taken if I'd gotten the job at Montgomery Ward and if I didn't persist.
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