凭证式国债挂失说法正确的是（）。
A.密码挂失可以委托代办
B.挂失补发可以委托代办
C.正式挂失为全国任意网点
D.解挂为全国任意网点
参考答案：A
It is reported that the United States uses energy as the whole of Europe.
A．as twice
B．twice much
C．twice much as much
D．twice as much
β值衡量的是证券的系统风险，它表示证券收益波动对市场平均收益波动的敏感性。
