【毎日のテーマ】【工程版20160609】
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参加報酬:2財富。正解の報酬:9財富クレーンの昇降可能な高さとは、( )のことです。
A、フックから地面までの距離
B、吊り上げる荷物の高さ
C、クレーンアームの長さ
D、一定の値ではない
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