22. China has currently built 9 tidal power stations, the $\qquad$ tidal power station, completed in 1980, is China's first bidirectional tidal power station, and it is also one of the largest bidirectional tidal power stations in the world.
A. Xiamen
B. Jiangxia
C. Humen
D. Sanya
【Answer】B
【Analysis】Tidal energy generation is a form of ocean energy generation. It is the earliest developed, largest in scale, and relatively mature technology in the utilization of ocean energy. The principle of tidal power generation is similar to that of hydropower generation. It utilizes the potential energy generated by the water level difference caused by the rise and fall of tides, converting the energy of the rising and falling tides into mechanical energy, and then converting mechanical energy into electrical energy (power generation). Since the flow of tides differs from that of river water, which changes direction continuously, this has led to different types of tidal power generation, such as: (1) Single-reservoir unidirectional type, which can only generate power during the ebb tide. (2) Single-reservoir bidirectional type: which can generate power during both the flood and ebb tides. (3) Double-reservoir bidirectional type: which can generate power continuously, but is economically unviable and has not been put into practical use. China's coastal areas have built 9 small tidal power stations. The Jiangxia Tidal Power Station, completed in 1980, is China's first bidirectional tidal power station and also one of the largest bidirectional tidal power stations in the world, with a total installed capacity of 3200 kilowatts and an annual power generation of 10.7 million kilowatt-hours.