毎日1問、正解者には5つの富を、参加者には2つの富を報酬として与えます；第321題 [

2016-07-15View Original

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選択：天然繊維に属するのは、次のうちどの物質か（）。 A、接着繊維； B、炭素繊維； C、アスベスト； D、ナイロン。 C、アスベスト；

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毎日1問、正解者には5つの富を、参加者には2つの富を報酬として与えます；第321題 [

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