【判断题】lDS是一种主动保护自己免受黑客攻击的网络安全技术,往往是网络的第一道安全闸门。
【单选题】What dose "Rain cats and dogs" mean?
A.
Cats and dogs are fallen from the sky.
B.
It is pouring ouside, and the rain is so heavy.
C.
Cats and dogs are jumping so high that it looks like they are flying in the sky.
【单选题】小红觉得自己长得胖,学习成绩又不好,总是沉默寡言,她很想和同学交流,又怕同学瞧不起自己。小红的这种心理是________的表现。( )
【判断题】瞬态响应是系统受到外加作用激励后,从初始 状态到最终或稳定状态的响应过程。
【单选题】听力原文:W: Oh, it's just pouring down! We'd better wait until it lets up a little since we still have time. M: I don't think it's going to let up. We'd better make a run for it. Q: What are the speakers ...