企业资源计划
参考答案：企业资源计划简称ERP其核心管理思想就是实现对整个供应链的有效管理。
The president was so absorbed in his work that not a sound ______.
A．did she dare to make
B．dared she to make
C．she dared make
D．she did dare to make
一次水系统
