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毎日1問、正解しても賞品なし、娯楽を目的とする

2019-12-21View Original

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49.()とは、金属が外力の作用を受けても破壊されない永久変形能力のことである。?A、塑性 B、靭性 C、弾性 昨日の問題:C 48.カップリングの加熱による組み立てにおいて、特別な技術的要件がない場合、炎による加熱の最高温度は()を超えてはならない。?A、200℃ B、300℃ C、400℃

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