塑料水管通常是最便宜的也是最易安装的。

Plastic pipes are often the cheapest and easiest to lay.

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解析有关塑料埋地排水管的一些疑问。

Some problems about buried plastics pipe are analysed in the paper.

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水管可以由金属、水泥、塑料或竹子制成。

Pipes may be made of metal, cement, plastic, or bamboo.

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水管可以由金属、水泥、塑料或竹子制成。

Pipes may be made of metal, cement, plastic, or bamboo.

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