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What is the unit of 2 1 1?

Kunming Institute of Physics.

2 1 1 Institute is one of the earliest high-tech institutes engaged in infrared science and technology research in China. The research institute is a social enterprise and institution whose main purpose is scientific research. In China, it is a research institution established for special scientific research purposes and tasks, and now it mostly exists in the form of enterprises. In academic circles, it is called the research department of scientific experiments.