Asphalt epo, awọn ohun elo aise jakejado, awọn idiyele kekere. Sibẹsibẹ, awọn ipo iṣẹ ti ko dara, nira lati ṣe iṣeduro didara, idoti ayika to ṣe pataki. Iposii ti edu, rọrun lati ṣiṣẹ, ṣugbọn igba pipẹ ti o bo Layer jẹ imularada nipasẹ ipa ayika, o dara fun iṣẹ aaye, atẹle 10 ℃ diffi…
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