在执业中注册会计师须对助理人员及专家的工作负直接责任。( )
参考答案：错
— Did that book give the information you needed?
— Yes, but ______, we had to read it almost entirely. [ ]
A. for finding it
B. to find it
C. finding it
D. by finding it
A发送一份带有数字签名的文件给B，则B可以使用（）验证数字签名的正确性
A.A的公开密钥
B.A的私有密钥
C.B的公开密钥
D.B的私有密钥
