매일 한 문제, 정답자에게 5개의 부를 지급하며, 참가 시 2개의 부를 지급합니다；제312문 [
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선택: 나일론 1010은 처음으로 어느 **에서 개발에 성공했나( ). A、미국 B、일본 C、중국 D、독일 C、중국
나일론 1010은 처음으로 어느 곳에서 **개발에 성공했는가 (B). A、미국 B、일본 C、중국 D、독일
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