BSP对大型信息系统的基本概念是 ______ 地系统规划， ______ 地分布实现。
参考答案：自顶向下 自底向上
It is reported that great ______ made to look into the case have paid off.[ ]
A. attentions
B. efforts
C. troubles
D. cares
Java中对象加锁具有 【8】 性。
