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名前：Connor日付：2015/01/03 14:36:59
How do I get an outside line? buy sildenafil citrate In studying Tycho’s supernova, researchers have established that the outward shock wave continues to travel at Mach 300. Meanwhile, the violent backwash is currently speeding inward at Mach 1000. One of the study’s co-authors, Randall Smith, explains the nature of this shock wave:
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