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1. |
To overcome the difficulty of losing the surface activity of the surfactants above 50,000 ppm salt which of the following is required? |
A. | After the flush of low saline water |
B. | After the flush of high saline water |
C. | Pre-flush of low saline water |
D. | Pre-flush of high saline water |
Answer» D. Pre-flush of high saline water | |