(4)污染等級(jí):工業(yè)用按鈕開(kāi)關(guān)周?chē)植课⒂^環(huán)境的污染級(jí)為3級(jí),只有在有效地使用防護(hù)外殼或密封等方法后才有可能降低污染等級(jí)至2級(jí)。
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