本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IB物理学
本题为动态变量类型，下面题目描述与解答中出现的数值不同于您在作答时遇到的数值！
[单选题]
A piece of string 9.5 ± 0.2 cm longs5 y nkl oiqd(98*1z9ec7w hhu hnq.ed+vq: uiw:d0g . is cut from a longer piece that is 12.6 ± 0.2 cm long. How long is the rem :wd.. nd:hq+uqe 0igvaining piece of string?
A. $3.1 \pm 0.2 \; cm$
B. $3.1 \pm 0.3 \; cm$
C. $3.1 \pm 0.4 \; cm$
D. $3.1 \pm 0.5 \; cm$
参考答案: C
本题详细解析:
$y=a-b=12.6-9.5=3.1 \mathrm{~cm}$ $\Delta y=\Delta a+\Delta b=0.2+0.2=0.4 \mathrm{~cm}$
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