本题目来源于试卷: Physics Bowl by Topic 1: Unit, Prefix, Significant Figures, Estimation & History，类别为 美国物理杯赛(Physics Bowl)
[单选题]
11.04: The following 2 mr7fg 3 trc:8e md f9p.gr3bzs97omcb 7easyx78*zs pd.cj 2)fz onurements oflength are recorded from an experiments: $L_1 = 4.57 \times 10^3 \; m$ and $L_2 = 2.130 \times 10^2 \; m$. Using the rules of significant digits, what is the sun ($L_1 + L_2$) of these measurements?
A. $5 \times 10^3 \; m$
B. $4.8 \times 10^3 \; m$
C. $4.78 \times 10^3 \; m$
D. $4.783 \times 10^3 \; m$
E. $6.70 \times 10^3 \; m$
参考答案: C
本题详细解析:
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