A:11
B:13
C:8
D:4
春天,“荷兰花海”花香满园,这一现象表明( )
He is 2 years than you.
— I know. In November, 2010. So Guangzhou is busy preparing for it.
“神舟”五号飞船飞行过程中,由多个地面测控站和四艘“远望”号远洋航天测量船组成了测控网,通过发射和接收一种波,对飞船进行跟踪、测量与控制,这种波是( )