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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313題 [

2016-06-20View Original

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選択:以下のうち、高分子合成材料を製造するための基本原料でないものはどれか( )。 A、鉱石; B、石油; C、天然ガス; D、石炭 A、鉱石;
Reply #22016-06-20
次のうち、高分子合成材料を製造するための基本原料でないものはどれか( )。 A、鉱石;

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