When using fixed installations for melting bitumen at construction sites in cities and towns, these fixtures should be of the sealed type.
城镇建筑施工熔化沥青使用固定熔化装置时，应当采用密闭方式。
When using fixed installations for melting bitumen at construction sites in cities and towns these fixtures should be of the sealed type.
城镇建筑施工熔化沥青使用固定熔化装置时，应当采用密闭方式。
When using fixed installations for melting bitumen at construction sites in cities and towns these fixtures should be of the sealed type.
城镇建筑施工熔化沥青使用固定熔化装置时，应当采用密闭方式。
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