The boy′s name is .
A:He guohua
B:He Guo hua
C:He GuoHua
D:Heguohua
如图,圆O过点B、C,圆心O在正△ABC的内部,AB=23,OC=1,则圆O的半径为( )
如图所示,烧瓶中的水停止沸腾后,若从烧瓶中往外抽气,会看到水又沸腾起来,这是由于( ).
网上流行这样一首歌,歌词的内容如下:北京人说他风沙多,A地人笑了;A地人说他面积大,新疆人笑了;新疆人说他民族多,云南人笑了;云南人说他地势高,西藏人笑了;西藏人说他文物多,陕西人笑了;陕西人说他革命早,江西人笑了……。关于歌词中的A地的说法正确的是( )
——Though radio and television are ____ popular in the world today, I think the TV is ____ useful.——Of course, on TV we can see and hear what is going on home and abroad.