left-turn flow proportion 左转比例
turn-back flow heat exchanger 折流式热交换器
operational characteristics of right-turn flow 运行特征
u-turn car flow 调头车流
the Turn of Flow 气流转向
left-turn traffic flow 左转交通流
right-turn traffic flow 右转交通流
turn-around duct flow 弯曲管道流动
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