Hardened backing plates are required under all pads that bottom out. 最底下的那塊墊板后應該加一塊熱處理背板。
This test method is not intended for use in testing corrugated boxboard, liner board, or hardboards that tend to cut the thin rubber diaphragm. 這個試驗方法不用於試驗割成薄的橡膠橫隔膜的瓦楞盒紙板，墊板或硬紙板。
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