F-HZ-HJ-SZは何の意味ですか！
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F-HZ-HJ-SZという規格において、FとHZはどのような意味を持つのでしょうか。ご教示いただければ幸いです。ありがとうございます！
これはファイル番号に過ぎず、実質的な意味はありません。
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