泄水管要求有防冻保护措施。

Drain piping may require to be protected against freezing.

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由泄水管和梳形散水板组成淋水装置。

A water-spraying device is composed of a drain pipe and a water-spraying plate.

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由泄水管和梳形散水板组成淋水装置。

A water-spraying device is composed of a drain pipe and a water-spraying plate.

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