作者署名权的保护期限为 ( )年。
A.10
B.20
C.50
D.不受限制
参考答案:C
— What great changes have taken place in our city in the last few years!
— Indeed, many high buildings have _______all over the city.
A.wound up
B.sprung up
C.held up
D.made up
在现金管理中随机模型适用于未来现金流量稳定的企业。( )