【单选题】The symbol below represents a(n) ________.
【单选题】The symbol below represents a(n)
【单选题】The symbol below represents a(n)
【单选题】The symbol below represents a(n)
【单选题】The symbol below represents a(n) ___
【单选题】The symbol below represents a(n) ________.
【单选题】The symbol below represents a(n) ________.
【简答题】( 只填字母,中间不要用符号隔开,如: ACD ) 1)哪些是正数? 2)哪些是整数? 3)哪些是分数? 4)哪些是非负数? 5)哪些是 有理数?