# ChatGPT／t4／3回目／2026-09-29
# モデル表示: 中程度／所要 20.2秒／310文字
# 採点: 正解（URL 3/3本が実在）

https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors

https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8

https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9