current hour
4.The tidal bore of the Qiantang River in the Gulf of Hangzhou of East China is the most spectacular in the world. The sprays of the surging tidal bore reach as high as 8.93 metres with a current velocity of 24 kilometres per hour. Its roar can be heard within a circumference of 22 kilometres. This accounts for a Chinese description that“the roar of the tidal bore sounds like ten thousand armies.”

6.With the fast development of power electronic technology, much non-linear load emerging in power system led to the severe aberrance of current and voltage wave, so the metering error of watt-hour meter (induction watt-hour meter and full electronic watt-hour meter) used in the power department should be considered.

