Answer: A B D E
General value-added tax taxpayers who sell the following self-produced products can choose to calculate and pay value-added tax at the rate of 6% according to the method simplified:
(1) Electricity produced by small hydroelectric units at or below the county level. Small hydropower units refer to small hydropower units with an installed capacity of less than 50,000 kilowatts (including 50,000 kilowatts) built by various investment entities.
(2) Sand, earth and stone used in construction and the production of building materials.
(3) Bricks, tiles and lime continuously produced from self-extracted sand, earth, stone or other minerals (excluding solid clay bricks and tiles).
(4) Biological products made from microorganisms, microbial metabolites, animal toxins, itsng or human or animal tissues.
(5) Tap water. Water companies which are subject to VAT will pay VAT on sales of tap water at a rate of 6% in a simplified manner and will not deduct the VAT indicated on the VAT deduction certificate for their purchase of tap water. tap water.
(6) Commercial concrete (limited to cement concrete produced with cement as raw material).
In principle, there is not much difference. They both rely on water to drive the rotor to turn to produce electricity. However, hydropower generally refers to the use of height differences in reservoir water levels to produce electricity, which requires larger devices. The tap water pipes are so thin and the installation is small. I'm afraid the difference between the two is not minimal in terms of technical details. As far as I know, hydro technologyelectric is mature. If hydroelectric technology is used as a benchmark in producing electricity from tap water, it will at most be considered a practical new technology and not an invention.
And from the point of view of energy saving, the water pressure in the water pipe is obtained by human consumption of energy. Adding devices to the water line will definitely cause the water to lose some water pressure, meaning the water company's pressure. energy is lost. The ideal is to convert the water company's energy into your own electricity without loss, while sacrificing your own water pressure. There is neither an increase nor a saving in energy for society as a whole.