甲年满9周岁，于家人不在时把家里价值1000元的玉器以300元卖给邻

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问题单项选择题

甲年满9周岁，于家人不在时把家里价值1000元的玉器以300元卖给邻居乙，家人回来后向邻居索还玉器，下列表述正确的是（）。

A、甲和乙之间的买卖合同是有效的

B、甲和乙之间的买卖合同是效力待定的

C、乙可以作价700元给甲

D、如果乙归还玉器，甲可以不返还300元钱

答案

参考答案：B

单项选择题

Which of the following is not a disadvantage of using statistical approaches to quantify risk

A．Input data may be inaccurate and incomplet

B．Managers sometimes rely on computer-produced results that are detailed and impressive but inaccurate，which makes decision making difficul

C．Risk experts can understand the complex statistical approaches but they are not good at communicate with they kno

D．When applying in quantitative risk analysis，statistical approaches are regard as too theoretica

单项选择题

ISMP网管只管理综合业务管理平台，提供配置管理、（）、性能管理、安全管理等功能。

A.业务管理

B.告警管理

C.群发管理

D.号段管理