back-up tape
... 备用断路器 back-up breaker 节焊带(单面电焊) back-up tape 后曲轮叶 backward curved vane ...
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端面有间隙、带凸台对接外形是指在标准节上部主弦杆上焊有定位凸台，定位凸台伸人另一标准节主弦杆内，上、下套管之间留有一定间隙配合定位。
End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
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