A:Sorry to hear that.
B:How about that?
C:Don’t mention it.
D:Never give up.
将二氧化硫与氧气进行等质量混合,则混合气体中硫元素与氧元素的质量比为( )
(箭头处文字:开展专项整治行动;增设监控抓拍设备;罚款扣分媒体曝光;张贴海报志愿者劝导)
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