【单选题】Electronic mail has become an extremely important and popular means of communication. The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of un...
B.
fraudulent e-mail messages
C.
large volume of messages
D.
increasing amount of unwanted e-mail
【单选题】电力电缆的电容大,有利于提高电力系统的( )。
【简答题】人教版三年级下册数学新编基础训练练习十二(2)答案
【单选题】钢丝钳(电工钳子)一般用在( )操作的场合。 A.低温 B.高温 C.带电 D.不带电
【单选题】钢丝钳(电工钳子)一般用在( )操作的场合。 A、低温 B、高温 C、带电 D、不带电
【多选题】下列属于电缆优点的是()。
B.
电缆的电感较大,有利于提高电力系统的功率因数
【简答题】电力电缆的电容大,有利于提高电力系统的()。
【简答题】人教版三年级下册数学新编基础训练练习十二(1)答案
【单选题】Electronic mail has become an extremely important and popular means of communication. The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of un...
B.
fraudulent e-mail messages
C.
large volume of messages
D.
increasing amount of unwanted e-mail
【单选题】电力电缆的电容大,有利于提高电力系统的( )。