“几年来佩珀博士的广告变化如此之多以致公司从来没有真正地在顾客心中建立其软饮料的形象”，这属于定位错误中的（）。

A.定位过低

B.定位过高

C.定位混乱

D.定位怀疑

Each NCS woks as a type of（）, assisting controlling and monitoring telex and telephone network as quickly as possible.

A.switch operator

B.communication gateway

C.national operator

D.on-scene commande