A. 0.4 B. 0.6 C. 0. 5 D. 0.3A

恬恬2020-05-20  9

问题

选项 A. 0.4B. 0.6C. 0. 5D. 0.3

答案A

解析[img]/upload/tiku/131/296541_1.jpg[/img]
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