According to the maintenance speciality, discussion is made on the asphalt pavement mainly from preliminary maintenance, daily maintenance and seasonalmaintenance.
针对沥青路面的养护特点，从初期养护、日常养护及季节性养护三个方面对沥青路面养护进行了论述。
2
For example, to do routine maintenance and regular maintenance work, but also good sealed maintenance, maintenance, maintenance and withdrawal take seasonalmaintenance work.
比如要做好例行保养和定期保养工作，同时还要做好封存保养、停用保养、走合保养和换季保养等工作。
3
Naphtha is expected to see a seasonal demand lull after the Lunar New Year, especially with many ethylene producers embarking on regular maintenance in March.