Please select the most similar patent number from A, B, C and D. Which number is?
A subsidence-area-based semi-underground pumped storage power station, comprising: a high-level water storage area and a low-level water storage area (20), a water delivery channel (15), and a two-way generator set. The water delivery channel (15) is communicated between the high-level water storage area and the low-level water storage area (20). The two-way generator set is provided between the high-level water storage area and the low-level water storage area (20). The two-way generator set is utilized for pumped storage or power generation by means of the water delivery channel (15). The high-level water storage area is a ground subsidence area (18) of an abandoned mine. The low-level water storage area (20) is an underground water storage area. The underground water storage area is located in an underground space of the abandoned mine. Also comprised is a forming method for the subsidence-area-based semi-underground pumped storage power station.
A: Disclosed is a heat-radiating internal-circulation power generation device, comprising a solar energy tube (5), three high-positioned expansion reservoirs (6-1, 6-2, 6-3), a low-positioned oil storage reservoir (25), three circulation pumps (8-1, 8-2, 8-3), an energy storage tank (7), a constant temperature furnace (12), a condensed water expansion tank (10), a high pressure plunger pump (13), a high pressure atomizing device (14), a steam generator (15), a steam storage tank (18), a steam turbine (19), a power generator (20), a circulating steam duct (21), a steam condenser (22) and a condensed water pipe (23). In the energy storage tank (7), a saline solution is used as an energy storage medium. Complementary heating of heat conductive oil with other multiple energy sources and solar energy is achieved by the constant temperature furnace (12). The steam generator (15) has layers of annular sealing ducts and the heat conductive oil circulated within the system conducts heat to the steam generator (15), such that an atomized moisture flow is instantly converted into high temperature and high pressure steam to arrive at a critical effect. The present device has the advantages of a long service life and easy maintenance, and is applicable in the fields of large-, middle- and small-scale power generation.
B: A water supplement device for a toilet bowl rim and toilet (20) having the same. Water draining of the water supplement device is independent of that of a toilet tank (30). The water supplement device comprises a water storage container (10), a water inlet (11) provided at the top of the water storage container (10), and a water draining opening provided on a bottom surface thereof, wherein the water draining opening is connected to a toilet bowl rim water passage. A flapper (40) for opening/closing the water draining opening is mounted in the water storage container (10). A water storage area (12) is provided in the water storage container (10) and comprises a flow guiding channel (13), wherein an end of the flow guiding channel (13) is connected to the water inlet (11), and the other end extends to the water storage area (12), and is located below a maximum water level of the water storage area (12) or level with the maximum water level of the water storage area (12).
C: A generator system for horizontal use and reutilization of hydroenergy comprises a reservoir disposed upstream of a river, a flow channel disposed on a riverbed in a flowing direction of the river, and multiple hydro turbine generator sets and a motor room (4) installed on the flow channel. The flow channel comprises a load bearing dike (1) and a sluice (2) disposed on the load bearing dike (1). The sluice (2) is provided with a water inlet (21) and a water outlet (22). The water inlet (21) is in communication with the reservoir and provided with a water inlet gate (23). The water outlet (22) is directed toward downstream of the river. The multiple hydro turbine generator sets are disposed at even intervals on the sluice. The generator system utilizes the variation of the height of natural water level and reutilizes the hydroenergy for power generation to obtain constant and stable electric energy.
D: A pedal-type mopping water bucket and a flat mop that matches same, comprising a bucket body (1) made of a plastic material. A water storage area (1b) and a washing and draining area (1c) that are independent of each other are disposed in the bucket body (1). A communication passage (A) is disposed between the water storage area (1b) and the washing and draining area (1c). A pedal (5) is disposed below the water storage area (1b) and the washing and draining area (1c), and the pedal (5) is connected to a lifting switch (4). When the pedal (5) is not depressed, the lifting switch (4) blocks the communication passage (A) between the water storage area (1b) and the washing and draining area (1c). When the pedal (5) is depressed, the lifting switch (4) leaves the communication passage (A) such that the water level is changed between the water storage area (1b) and the washing and draining area (1c) according to the principle of communicating vessels. A single bucket is internally and separately provided with a water storage area (1b) and a washing and draining area (1c), and when the water level flows therebetween, the cleaning and draining of a mop are integrally completed in a T-shaped port, and the foregoing bucket is convenient to use.
Answer: C