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毎日1問、正解者には5つの富が報酬として与えられ、参加すると2つの富がもらえます;第289題

2016-04-19View Original

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選択:通常、**石油化学産業の発展水準を測る指標として用いられるのは:( ) A、石油の生産量 B、天然ガスの生産量 C、エチレンの生産量 D、石炭の生産量 C、エチレンの生産量

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