【判断题】根据人类学文化相对论理论的观点,我们要保护一切传统文化。
【单选题】对国家而言,制度建设是一项浩大的系统工程,不可能一蹴而就;要建立全面、完善的社会经济管理制度,往往任重道远。这说明 ()
【多选题】比较 OFDM 和 FDM ,下列关于两者的相关描述正确的是 。
A.
FDM 调制各个子信道需要有额外的保护频带。
B.
OFDM 调制各个子信道相互正交,子信道频谱可以重叠。
C.
OFDM 比 FDM 具有更高的频谱利用率。
【单选题】North Pole Explorations If Santa Clans really does reside at the North Pole, he must live a lonely life. The North Pole isn't what most of us would consider a hospitable place as the average winter te...
A.
it delivers an undisturbed home for many animals
B.
most creatures cannot adapt to its environment
C.
only Santa Claus likes living there with his reindeer
D.
only a few kinds of creatures can't bear its coldness
【单选题】以下关于应用相对数时的描述正确的是( )
B.
观察单位数不等的几个率的平均率,不能将这几个率直接相加求其均值