字电视按照传输方式分类,也可以分为()、()和()三种。
参考答案:卫星;有线;地面
Tom concluded his lecture ________ that he couldn’t emphasize enough how important our efforts were.
A.to say
B.saying
C.said
D.having said
鼻泪管开口于鼻腔的( )
A.上鼻道
B.中鼻道
C.下鼻道
D.总鼻道