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

鼻源性颅内并发症包括（）。

A.硬脑膜下脓肿

B.海绵窦血栓性静脉炎

C.脑脓肿

D.硬脑膜外脓肿

E.化脓性脑膜炎