答案：D
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0.032~3\mbox{ (準確至三位有效數字)}
\end{array}$
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0.032~3\mbox{ (準確至三位有效數字)}
\end{array}$
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0.0323\mbox{ (準確至四位小數)}
\end{array}$
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0.032~252\mbox{ (準確至五位有效數字)}
\end{array}$
$\begin{array}{cl}
& 0.032~251~5 \\
= & 0.032~252\mbox{ (準確至六位小數)}
\end{array}$
