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参加報酬：2財富。正解の報酬：9財富 挿入式振動機を使ってコンクリートを打設する際は、（ ）にコンクリートを振動させるのが適している。A、ゆっくり挿入・ゆっくり抜去 B、素早く挿入・ゆっくり抜去 C、素早く挿入・素早く抜去 D、ゆっくり挿入・素早く抜去
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