BACKPASS UPPER HEADER 包墙上集箱
WATER W ALL UPPER HEADER 水冷壁上集箱
upper-layer header 上层头 ; 上层报头 ; 上层协议选项包头
upper oil-header 上集油箱
Upper circulation header 上循环集箱管
Tube bundle fix the drooped structures through welding for both ends of upper header and make fly ash drop by rapping the end plate of lower header.
锅炉中的管束是上部集箱的两端通过焊接固定垂下的结构，通过锤打下部集箱的端板，振落飞灰。
Is placed in the header on 59% of the sites (76% of them have a "sign-up" -link placed at the right upper corner)?
59%的网站是放在网站的顶部(其中76%是被放在右上角)？
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