複選題23. What statement is NOT true about standard electrode potentials? (A) E° cell is positive for spontaneous reactions. (B) Electrons will flow from more negative electrode to more positive electrode. (C) The electrode potential of the standard hydrogen electrode is exactly zero. (D) E° cell is the difference in voltage between the anode and the cathode. (E) The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive E°.