计算机病毒的特点可以归纳为()。
A.破坏性
B.潜伏性
C.传染性
D.可读性
参考答案:B, C, D
—_____ does your father surf the Internet?
—Never. He doesn't like it at all.[ ]
A. How often
B. How long
C. How soon
角杆角深的测量可分为(),()测量。