Bellow's corrugation usually is formed by complicated equipment and is cost is high.
波纹管波纹的成型大都采用结构复杂、成本高的设备成型方式。
The combination of corrugation and the circular tube results in an extremely strong structure.
波浪纸板和圆筒状两者结合，会成为非常坚固的构造。
The combination of corrugation and the circular tube results in an extremely strong structure.
波浪纸板和圆筒状两者结合，会成为非常坚固的构造。
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