特殊用法crankcase oil foaming1.曲轴箱润滑油起泡沫in-skin foaming1.带皮泡沫法(泡沫胶外包一层聚氯乙烯薄皮)oil foaming1.油生成泡沫wild foaming1.(啤酒)涌沫, [俗]冒沫