汽油中胶质含量过高时,对发动机有哪些危害?
有压顶的女儿墙应将屋面防水层做至压顶层下面,卷材压入不小于()并用油膏将收头封严。 ["50mm","100mm","150mm","200mm"]
铝及铝合金壁厚小于或等于5mm的管道组对内壁错边量不大于()。 ["0.3mm","0.4mm","0.5mm","1.0mm"]
垂直于屋脊铺贴时,卷材应搭接于屋脊下面至少()以下。 ["500mm","300mm","200mm","100mm"]
提高汽油辛烷值有哪些方法?
汽油的蒸发性与车辆使用的关系如何?