2300439256 读作:two billion three hundred million fourhundredand thirty –nine thousand twohundred and fifty-six正确吗?
A. 对
B. 错
12345678901 读作:twelve billion three hundred and forty-fivemillionsix hundred and seventy –eightthousand ninehundred and one正确吗?
A. 对
B. 错
请说明类的关联关系、聚合关系、组合关系,这三者之间的区别和联系。