所谓储备风险是指国家、银行、公司等持有的储备性外汇资产因汇率变动而使其实际价值减少的可能性。
参考答案：对
Miss Green didn't tell us ______ in 2002, but now she lives in our school. [ ]
A. where does she live
B. where she lives
C. where did she live
D. where she lived
下列有关氮化碳的说法中，不正确的是
A．氮化碳晶体属于原子晶体
B．氮化碳中碳显—4价，氮显+3价
C．氮化碳的化学式为C3N4
D．每个碳原子与四个氮原子相连，每个氮原子与三个碳原子相连
