SGK全自动扩口机是处理PVC塑料硬管扩口的设备，扩口方式为直扩口和r扩口两种形式。
SGK Double-over full automatic belling machine is specially used for belling of PVC pipes. belling type have straight type and R type.
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.
市面上有塑料软管，塑料弹性管和塑料硬直管(通常3米)以供使用。
They are available in both lengths of coiled, flexible pipe and in rigid lengths, (commonly 3 m).
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