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Super G is unique in that it is conducted over one run, like Downhill, but racers are not permitted to train the course at full speed before the race. As in Giant Slalom and Slalom, they are allowed only a one hour visual inspection of the course on the morning of the race.
In DH the course is usually longer and covers a wide variety of terrain including steep and flat terrain. In DH, the flags are spaced far apart from each other, but there is no minimum on the course, just as long as the skier can see the next one. In Super-G there are a set number of flags as a minimum. In Super-G the skier rarely encounters any straight sections of the course and DH courses sometimes have a section or two that does not involve constant turning. Check out the FIS website for details or wikipedia for some more base info.