自由负重器械和机器负重器械都是受欢迎的力量训练工具，但它们不是唯一的选择，你可以用并不昂贵的阻力塑料管（译者：我猜是指用硬塑料管之类的代替拉力器啥的），或者甚至用自身体重进行力量训练（译者：俯卧撑嘛）。
Free weights and weight machines are popular strength training tools, but they're not the only options. You can do strength training with inexpensive resistance tubing or even your own body weight.
文件的硬(60rc)高强度铝合金管提供了一个平稳无腐蚀密封面和良好的耐磨性。
The file hard (60rc) high strength aluminum alloy tube provides a smooth corrosion free sealing surface and excellent abrasion resistance.
文件的硬（60RC）高强度铝合金叶管提供了一个平滑，无腐蚀耐磨密封面。
The file hard (60RC) high strength aluminum alloy lobe tube provides a smooth, corrosion-free abrasion-resistant sealing surface.
本实用新型涉及一种用于将胶管之类套在硬管接头上的软管卡紧连接的卡头。
The utility model relates to a locking head for locking and fastening the soft pipe including rubber type on the rigid pipe connector.
本发明涉及一种拧式钢丝喉箍，用于管道连接中软管和硬管密封固定。
The invention relates to a screw-type steel wire hose clamp used in sealing fixation of flexible pipes and rigid pipes in pipeline connection.
这使得每个阀直接安装无需硬管或油管用一个执行机构。
This allows each valve to be mounted directly to an actuator without the use of hard piping or tubing.
这使得每个阀直接安装无需硬管或油管用一个执行机构。
This allows each valve to be mounted directly to an actuator without the use of hard piping or tubing.
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