以下不属于入侵病毒按传染方式分类的是()
A、磁盘引导区传染的计算机病毒
B、操作系统传染的计算机病毒
C、一般应用程序传染的计算机病毒
D、外壳病毒
参考答案:D
_____, the great mother, in order to save her sick child, kept waiting for four hours in the heavy snow.
A.It depends
B.Take it easy
C.Believe it or not
D.It is OK
A.I= ,从上向下
B.I= ,从上向下
C.I= ,从下向上
D.I= ,从下向上