海川論 安全のこと（毎日一論）
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孔板流量計は、孔板の前後の( )の変化に基づいて流量を測定するものです。 A、温度 B、圧力 C、体積 D、質量
これは本当にわかりません。LZのご配慮に感謝します。質問と回答を通じて、気づかぬうちに知識が増えていきます！！
AとB、落ち着け、落ち着け、落ち着け……
圧力差ですよ、標準の孔板でも別途差圧変換器を取り付ける必要があるんです
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