认为“自然美是客观的,艺术美来自于自然美”这一观点的代表人物是()
A.王夫之
B.叶燮
C.金圣叹
D.郑板桥
参考答案:A
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进行天然气置换,氮气置换空气时,测的氧气浓度低于()时合格。
A、1%
B、2%
C、5%