【单选题】According to the writer, E-mail has an obvious advantage over the telephone because the former helps one().
A.
reach a group of people at one time conveniently
B.
keep one's communication as personal as possible
C.
pass on much more information than the later
D.
get in touch with one's friends faster than the later
【单选题】市场细分是根据( )的差异对市场进行的划分。
【单选题】预防乙肝最好的办法就是打疫苗。研究表明,注射一次疫苗可( )有抗体。
【单选题】预防乙肝最好的办法就是打疫苗。研究表明,注射一次疫苗可____有抗体。
【判断题】信息化战争有作战空间全维多域,信息空间作用凸显的特点。
【单选题】预防乙肝最好的办法就是打疫苗。研究表明,注射一次疫苗可( )有抗体
【判断题】市场细分是根据产品的差异对市场进行的划分。 (1.0分)A. 对 B. 错
【单选题】以下各组中只有两个不属于航空器的有:( )
【单选题】One advantage e-mail has over a message taken over the telephone is that ________ .
C.
it has better sound effects
D.
it is accompanied by pictures
【多选题】下列哪些航空器属于重于空气的航空器(飞行器)。()