Dilational viscoelasticity of oil-water interface film formed by vacuum residue fractions from Iranian heavy crude oil was studied by using L-B method.
采用L B法考察了大庆减渣馏分油水界面膜的扩张粘弹性，并和伊朗重质减渣馏分油水界面膜的扩张粘弹性进行了比较。
Same as type l, but has additional lip for dustproof, can be applied in heavy dust environment.
与L型相同，但增加刮尘唇，可应用于多粉尘环境。
Series "l" and Series "XL" Air Platforms are heavy-duty, welded steel structures designed for carrying large loads up to 150,000 LBS.
和XL系列的气动托盘是一款重型，钢结构焊接设备，可承受载重量达到150,000磅。
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