【单选题】设信号的波特率为500Baud,采用幅度-相位复合调制技术,由4种幅度和8种相位组成16种码元,则信道的数据速率为( )。
【单选题】设信号的波特率为500Baud,采用幅度-相位复合调制技术,由4种幅度和8种相位组成16种码元,则信道的数据速率为()。
【判断题】构建人类命运共同体就不能维护以联合国为主导的、 以联合国宪章为核心的国际体系。()
【单选题】下列关于巨幼红细胞贫血的描述,不正确的是
E.
人体内贮存的维生素B12可供人体使用3-6年
【单选题】Mark suggests that they _____.
A.
eat their picnic while travelling along the river
B.
move over to the bank and stop for a while
C.
eat their picnic in about ten minutes
D.
move over to the bank and eat their picnic
【单选题】弹簧在交变应力下工作,除应有高的强度和弹性外,还应有高的( )。
【简答题】Mark
suggests that they _____.A. eat their picnic while travelling along the river B. move
over to the bank and stop for a while C. eat
their picnic in about ten minutes D. move
over to the bank and e...
【单选题】弹簧在交变应力下工作,除应有高的强度和弹性外,还应有高的( )。
【单选题】在违约金的性质上,认为其具有惩罚性的国家是( )。