I
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• The course covers three years.
• The laboratory course extends over the first two years.
• Each pulse lasts for 5x10 -9 second.
II
• These investigations are being continued .
• Although this study is ( still ) in progress , the experimental results appear to be sufficiently significant to ...
• After use, the gas flow persists long enough to allow ...
• The volcanic activity here began in the Eocene and ( still ) persists today .
• Production of sediment and sedimentary rock has gone on throughout the past years.