—The ______ film made me feel very ______ .
A:excited; excited
B:exciting; excited
C:exciting; exciting
D:excited; exciting
如图所示,当带正电的绝缘空腔导体A的内部通过导线与验电器的小球B连接时,问验电器是否带电?为什么?
下列关于种群密度的说法,不正确的是( )