题目内容
（请给出正确答案）
[主观题]
Assuming that the （) is zero, we can write a mass balance on the element as win-wout=qm .
A、pressure
B、velocity
C、net generation of matter
D、the mass flow rate into the system
提问人：网友liejack
发布时间：2022-01-07
题目内容
（请给出正确答案）
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