JMD吹风机管最适合用在弯道较多的地方，生产中有护孔圈以便于安装。
JMD Blower Tubing is excellent in areas where bends are common and product flexibility is desired. It is manufactured with grommets for easy installation.
本文介绍采用双护筒解决挖孔桩地表水渗漏问题，取得了较好的效果。
The paper introduced how to solve surface leakage of excavated pile with double protective casing and the better results have been achieved.
超级鼓型橡胶护舷与普通型橡胶护舷具有相同的安装螺栓孔距和螺栓孔。
YGCH super cell rubber fender has the same installation bolt pitch and bolt holes with the general rubber fender.
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