简述面向对象技术中聚合的概念。
参考答案:
聚合表达了成分对象和聚合对象之间的ispartof的联系,聚合实际是一种较强形式的关联联系
The vocabulary and grammatical differences between British and American English are so trivial and few as hardly ().
A.noticed
B.to be noticed
C.being noticed
D.to notice
肝脏是双重血液供应,25%~30%来自(),70%~75%来自()。