抽真空: creation of vacuumcreed receiving perforatordeaeratedegassingevacuationpick up the suctionvacuatevacuum pumpingvacuum supplyvacuum-extractionvacuum-pumpingvacuumize
Extraction tests were conducted on asphalt concrete specimens sampled from field roads . asphalt concrete and aggregate gradation were compared to design and acceptance specifications 对实际路面取样进行了抽提试验并与规范进行了比较分析。