A、<span style="font-family: 宋体;">非恒定均匀流</span><span style="font-family: 'Times New Roman';"> </span>
B、<span style="font-family: 宋体;">恒定非均匀流</span><span style="font-family: 'Times New Roman';"> </span>
C、<span style="font-family: 宋体;">恒定均匀</span>流
D、<span style="font-family: 宋体;">非恒定非均匀流</span>
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