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"可" is a morpheme, while "可以" is a word. With the meaning of "be able to", "可" and "可以" are interchangeable in most cases. When we answer a question, we should say "可以", which means "fine", or "OK". When coming to popular culture, some of us would just answer "可", which is not literally supposed to. Say, if you answer like this, we could still understand. ...
It's called 免洗洗手液. 免洗 doesn't mean it's not a liquid or doesn't contain water, it means you don't need to wash the hand sanitizer off with water. BTW I only have seen hand sanitizer in hospital in China. Unlike it is everywhere in North America (in malls, office buildings etc.)
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