Mr Jones was purchasing items to furnish his new house. He ordered all electrical and plumbing fi ttings from one supplier and these included an air-conditioning system. After being installed it transpired that the system could only provide cooling and no heating. Mr Jones is claiming that this is not what he ordered and that the supplier should replace the system provided and return the payment effected for the air conditioning system.Required:Explain what action, if any, can be taken against the supplier by Mr Jones. (10 marks)

煤炭自燃的条件是（）。

A.具有自燃倾向性的煤炭呈破碎堆积状态；有连续的通风供氧条件，维持煤炭氧化过程的发展

B.积聚氧化生成的热量，使煤的温度升高

C.上述条件同时具备，且大于煤的自然发火期