Cartridge and electronic cigarette

A cartridge, comprising:

• a main body with a liquid storage chamber therein, the main body comprising an upper end and a lower end, the main body provided with an air intake passage extending through the upper end and the lower end of the main body and an air inlet in communication with the air intake passage;
• a bottom cover mounted at the lower end of the main body, the bottom cover provided with a sensing air passage in communication with the air intake passage and a liquid injection opening and a pressure relief opening both of which are in communication with the liquid storage chamber;
• and
• a rotating liquid injection cover mounted to the bottom cover, the rotating liquid injection cover provided with a connecting through hole in communication with the sensing air passage, a first communication opening and a second communication opening;
• wherein the rotating liquid injection cover rotates about an axis relative to the bottom cover, the rotating liquid injection cover can be rotated between a first position and a second position;
• in the first position, the first communication opening is staggered from the liquid injection opening, the second communication opening is staggered from the pressure relief opening, and the connecting through hole is aligned with and in communication with the sensing air passage;
• in the second position, the first communication opening is in communication with the liquid injection opening, the second communication opening is in communication with the pressure relief opening, and the connecting through hole is staggered from the sensing air passage.