题目内容
用游标卡尺测得某样品的长度如图甲所示,其读数L=____________ mm;用螺旋测微器测得该样品的外径如图乙所示,其读数D=________ mm.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036215992196.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036215832293.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250036215992196.jpg)
50.85 4.702(4.701~4.703均可)
本题考查游标卡尺和螺旋测微器的读数方法.游标卡尺游标尺零刻度线所对主尺刻度为5 cm即50 mm,游标尺第17条刻度线与主尺对齐,故游标尺读数为0.05×17 mm=0.85 mm,因此样品长度为50.85 mm;螺旋测微器固定刻度部分读数为4.5 mm,可动刻度部分读数为0.202 mm,因此样品外径为4.702 mm.
![](http://thumb2018.1010pic.com/images/loading.gif)
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