下列哪些情况下知识产权权利人需要向海关总署提交变更备案申请?()
A.权利人名称变更
B.知识产权发生转让
C.知识产权内容发生变更
参考答案:A, B, C
Maintenance activities do not include ().
A.making enhancements to software products
B.developing a new software product
C.correcting problems
D.adapting products to new environments
下列各茶品中,属红茶类的是()。
A.大红袍
B.铁观音
C.碧螺春
D.金骏眉
E.普洱茶