题目内容

在测杨氏模量实验中,当负荷按比例增加或减少,读出相应的标尺数据时,发现标尺读数的增量面的不按比例增减,相差较大,不可能的原因( )。

A. 起初砝码重量合适,并且将金属丝完全拉直;
B. 金属丝锈蚀,粗细不均匀使金属丝产生剩余来变;
C. 光杠杆后足位置安放不当,与平台有摩擦;
D. 杨氏模量仪支柱未调整铅直,造成丝一端的夹头不能在平台圆孔中上下自由滑动。

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