매일 한 문제, 정답자에게 5개의 부를 지급하며, 참가 시 2개의 부를 지급합니다；제289문제
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선택: 일반적으로 석유화학 산업의 발전 수준을 측정하는 지표는 다음과 같습니다: ( ) A. 석유 생산량 B. 천연가스 생산량 C. 에틸렌 생산량 D. 석탄 생산량 C. 에틸렌 생산량
C. 에틸렌 생산량 ~~~~~~~
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