流域的划分依据是( )。
A．积水面积 B．行政区划C．分水线 D．历史遗留及人为划定
参考答案：C
---I have been waiting here for . But where is Tom?
---He is on his way back now.
A．sometime
B．some time
C．sometimes
D．some times
企业开展标准化活动的主要内容是？
