The identity element for multiply is 1
because a times 1 always gives you back a.
The identity element for the logical or operator is false
because a or false always gives you back a.
And the identity element for logical and is true
because a and true will always give you back a.
乘法的标识元素是 1
因为a乘以 1 总是返回你a。
逻辑或运算符的标识元素是假
因为 a 或假总是返回你 a。
逻辑与的标识元素是真
因为a 与真始终会返回 a。