下列关于卫星导航系统的表述不正确的是：（）。

A.GPS的信号强度与准度是可控的

B.GPS的欧盟建立的卫星导航系统

C.北斗导航系统是我国自主研发的卫星导航系统

D.“伽利略”导航系统是第一个基于民用的全球卫星导航系统

Mrs. Pearson cut judy’s hot dog into eight pieces and Sylvia’s into six pieces. Sylvia cried because she felt she wasn’t getting as much hot dog as Judy. Piaget would say that Sylvia doesn’t understand the principle of()

A．Conservation

B．Accommodation

C．Egocentrism

D．Object permanence