【空調版】毎日一問20180218
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矩形ダクトのサイズは320×250mmで、フランジの内径サイズは（ ）A、320×250 B、318×248 C、322×252 D、325×255 【答え】C
矩形の風管のサイズは320×250mmで、フランジの内径サイズは（C）です。A、320×250 B、318×248 C、322×252 D、325×255
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