一、前言当前世界各国都在大力发展以各种合成高分子材料为主的防水材料,特别是第二次世界大战以后,随着石油工业的不断发展,合成高分子材料被大量用于防水材料,使建筑防水材料出现了重大的技术进展。弹性体单层卷材迅速发展,如三元乙丙橡胶、氯丁橡胶、聚氯乙烯片材、丁基橡胶、氯磺化聚
thrift of excellent traditi onal a nd styl e lack deep of understa ndi ng, one -side d thi nk in now of good sit uation Xia, economi c smooth more fast development, a nd reform made major pr ogress, and people livi ng sig nificantly impr ove, a nd socia l the career made new progress, no ne cessary always hard has, no a warene ss to Chi na also ha s many poverty area, and also ha s many poverty po
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