【单选题】古希腊盲诗人荷马的作品中,被马克思称赞“显示出永久的魅力”的是:()
【简答题】电磁波在自由空间传播时 , 距离每增加一倍 , 损耗增加 ( )dB。
【判断题】电磁波在自由空间传播时,距离每增加一倍,损耗增加6dB。
【单选题】Which of the following statements is NOT true according to the passage? ______
A.
Hutongs and Siheyuans have been regarded to be a cultural asset.
B.
The covering area of Shichahai is overl46 hectares.
C.
Foreigners like going to bars located in Hutongs.
D.
There are 30 historical and cultural protected areas in Beijing.
【单选题】Now how many Hutongs are left?
【简答题】《荷马史诗》相传是由古希腊盲诗人荷马创作的两部长篇史诗,是——和——两部作品的统称
【判断题】电磁波在自由空间传播时,距离每增加一倍,损耗增加一倍。
【判断题】用天体来测定时节,这是一种比较科学和准备的测定方式。