Joke Collection Website - Joke collection - Do you like Lucky 52 hosted by CCTV host Li Yong? Get involved! Please guess a, b, c and d according to the following hints.

Do you like Lucky 52 hosted by CCTV host Li Yong? Get involved! Please guess a, b, c and d according to the following hints.

A, the only gas that can be used for steelmaking and rescuing patients is oxygen;

Answer: oxygen;

B, the main product of salt drying in seawater is sodium chloride, which can be used as a preservative for food in life;

Answer: sodium chloride;

C, according to the west-east gas transmission is natural gas, the main component is methane;

Answer: methane;

D, the main component of rust is iron oxide, red, belonging to the oxide;

Answer: iron oxide.