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毎日1問、正解しても賞品なし、楽しみが目的

2019-12-01View Original

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29. インボリュート円柱歯車を装着する際、接触点が逆方向に偏った不正な位置にあるのは、二つの歯車が()ためである。?A、軸線の歪み B、軸線が平行でない C、中心間距離が大きすぎる 昨日の問題の答え:A 8. 鋼中の()は有害元素である。?A、?S、PB、si、Mn???????C、P、Mn?

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