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What are the standards of British and American standard sockets, and what are the differences between them and the national standard (such as appearance, voltage, frequency, etc.)
American standard three-wire socket, one circle above and two vertical below; 1 10V，60Hz
The British standard has a vertical top of 230 V and 50 Hz and two horizontal sides.
The third line of the national standard, with a vertical line above and two diagonal lines below, is 220V and 50Hz.