[单选] A crew member reports that the high-pressure alarm light of a low-pressure CO₂ fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

A . an air leak has developed in the tank
B . the tank cooling system has malfunctioned
C . the pilot cylinder discharge valve is leaking
D . an excessive amount of insulation has been installed on the tank and piping

马柯维茨模型的实质是通过建立资产组合，使投资者在不损失收益的条件下最大程度地分散投资风险。研究资产组合的关键包括（）。分析风险资产的风险溢价。分析各项资产之间的相关程度。分析各项资产的权重。分析无风险资产。李小姐是一家外企的中层管理员，有50万元人民币，考虑到目前银行存款利率较低，而股市正走向牛市，想将这笔钱来做证券投资，李小姐在深圳证券交易所买了ABC公司的A股股票和ABC公司发行的可转换债券，并且买了正在发行的面值为100元的10年期国债，国债票面利率为5％，市场利率为5％，同时还购买了货币市场基金。李小姐持有债券表示其拥有一种权利，这种权利称为（）债权。资产所有权。财产支配权。资金使用权。在准入系统档案查询中，能通过下列哪些项目进行查询（）注册号。法定代表人。企业名称。企业住所。（）被认为是苏州古典园林中以少胜多的典范。网师园。留园。拙政园。环秀山庄。商业银行需要计量交易对手信用风险的交易有（）。 A.期货交易。 B.债券买卖。 C.即期外汇买卖。 D.远期交易。 E.债券回购。 A crew member reports that the high-pressure alarm light of a low-pressure CO₂ fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

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[单选] A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

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[单选] A crew member reports that the high-pressure alarm light of a low-pressure CO₂ fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.