工芸基礎知識（選択問題）2018022
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小型往復水ポンプでは、ピストンリングとしてしばしば布入りコルクが使用され、取り付ける前には必ず処理を行う必要があります。 A. 冷水浸漬 B. 熱水浸漬 C. スラッジオイル浸漬 D. サンドペーパー研磨
Bは必ず熱湯で浸す必要があります~~~
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