... duct loss 管道阻力损失 duct material 风道材料 duct noise 管道噪声 ...
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outlet duct for fine material 细粉排出管
material of air duct 风管材料
composite material for air duct 复合风管
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In addition, whereas barnacles just ooze out their cement, Crassicorophium processes its material in a spider-like spinning duct.
ECONOMIST: A species of crustacean makes silk underwater
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