| 摘要 |
<p>1275837 Generating foam CHEVRON RESEARCH CO 1 July 1970 [9 July 1969] 32029/70 Heading B1C [Also in Division El] Preformed gas/liquid foams, used in wells, have a liquid/gas volume ratio between 0.02 and 0.2. Foams are described in 1,221,162.</p> |
