VD HDとは何ですか？
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皆さん、ステーションの仲間たち。VDとHDの単位はどちらもkNで、これは荷重を表していますが、具体的には何を意味するのでしょうか？
VD、HDが荷重を表す場合、略語の文字から見ると、Vは垂直方向、Hは水平方向を意味します
VD HDはどこから来たのですか？正式名称は何ですか
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