In constant-current charging method, the supply voltage from discharged to fully charged condition____________?

A. prevent local heating
B. prevent short-circuiting
C. reduce path resistance
D. prevent corrosion

A. compactness
B. lower e.m.f.
C. small quantity of electrolyte used
D. higher internal resistance

A. water is poured into acid
B. acid is poured into water
C. anyone of the two can be added to other chemical

A. its chemical constituents
B. on the strength of its electrolyte
C. its temperature
D. all above

A. its voltage increases
B. it gives out energy
C. its cathode becomes dark chocolate brown in colour
D. specific gravity of H2SO4 decreases

A. five years
B. seven years
C. eight years
D. ten years