... head telephone 头戴受话器 head vent 封头排气 head-vs-capacity characteristic 压头容量特性[曲线]，H-Q曲线 ...
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floating head vent 浮头排出管
hydraulic head vent screw 液压装置排气口螺钉
exhaust head free vent 排气头自由发泄 ; 排气口头免费 ; 排气头自由口
AIR VENT HEAD 空气管头 ; 透气头
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It originates from the wall of the cloaca directly in front of the vent on the belly side, and curls backwards so the shaft and head lies directly beneath the vent opening.
它起源于泄殖腔壁侧面直接在前面的肚皮上发泄，和卷发向后使轴与头部直接位于下方的通风口开幕。
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And today there is a head of steam to vent.
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