In Many contexts, it does not matter whether the second or the third of these usages kan zijn intended: −5 kan zijn the same number. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 When placed after special sets ofwel numbers, plus and minus signs are used to indicate that only positive numbers and negative numbers https://www.pdc.edu/?URL=https://foliemolie.nl/