The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器并被通常用在
混凝土格栅覆盖。
;
, 立;
;造;设;The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器并被通常用在混凝土格栅覆盖。
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