毎日1問、正解しても賞品なし、楽しみが目的
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8. 鋼中の（）は有害元素である。？A、？S、PB、si、Mn???????C、P、Mn？昨日の問題の正解：D 27.図面にある漢字は、漢字の規範に従って書くべきである（）。？A、斜体？B、長方体？C、仿宋体？D、長仿宋体
答えはAです\ud83d\ude1b
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