请用这些词语各写一句话。

1．附近                                                                                                                   

2．常常                                                                                                                   

3．观察                                                                                                                   

验收手册位于网站知识中心目录下的（）目录下。

A.产品手册

B.功能与特性

C.技术指导

D.预警