质量流速仅与质量流量和管道的截面积有关，而与流体的温度、压强无关。
参考答案：对
---Mum , I think I’m _______ to go back to school .
--- But the doctor says you must stay in bed for two more days .
A．enough well
B．well enough
C．enough good
D．good enough
保健茶
