Holding profit or loss refers to the fact that the owner of the asset or liability passively bears the consequences of the price change on the value of the asset or liability due to the asset or liability. According to the above definitions, Which of the following are the holding gains and losses:. ['Xiaowen holds a certain stock, and he receives 30,000 yuan due to the change in stock price.', "The value of assets of a company's production equipment is reduced by 20,000 yuan due to consumption.", 'A company discounted (95 yuan) to issue bonds with a face value of 100 yuan, forming a spread of 5 yuan.', '000 yuan was lost due to mildew during the raw material storage of a unit.']