电磁场是电场和（）的总体。
A、磁场
B、磁通
C、磁感应
D、互感
参考答案：A
299. Heal(治愈) ____ , rescue ____, practise humanitarianism(人道主义) is the sacred duty of all the doctors and nurses.
A．wounded ... dying
B．the wounded ... dying
C．wounded ... the dying
D．the wounded ... the dying
[问题1] 何谓VLAN
