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The Human Development Index (HDI) is a summary measure of average achievement in key dimensions of human development: a long and healthy life, being knowledgeable and have a decent standard of living. The HDI is the geometric mean of normalized indices for each of the three dimensions.
Ski-Doo SDI-a quite different and more economical route to low two-stroke emissions and fuel consumption. SDI stands for Semi-Direct Injection, and it describes a system by which fuel is injected, not into the combustion chamber, but into the fast-moving air streams in the rear transfer ports.DI stands for serial digital interference. It is a video interface used within broadcast environments and supports both SD and HD signals. It runs on a single co-ax cable wit â¦ h BNC terminations.