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【简答题】
判断一个字符串是否合法的 Email 地址。 public class Blank_ 1 { public static void main(String[] args) { String email=JOptionPane.showInputDialog(" 请输入一个 email"); String pat="\\w+[@](\\w+[.])+[a-z|A-Z]{2,10}";// 定义正则规范 Pattern pattern= ; Matcher m= ; boolean flag= ; if(flag){ System.out.println(email+" 是一个 email 地址! "); }else{ System.out.println(email+" 不是一个 email 地址! "); } } }
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举一反三
【判断题】DNA的三级结构是指DNA双螺旋进一步扭曲盘绕所形成的特定空间结构。超螺旋结构是DNA三级结构的主要形式,可分为正超螺旋与负超螺旋两大类,它们在特殊情况下可以相互转变。
A.
正确
B.
错误
【单选题】What's the"blessing of email?
A.
With email, you only deal with its message on your own time.
B.
You can't avoid all the hellos, goodbyes and other unnecessary chit-chat.
C.
It's an interactive conversation.
D.
Email isn't designed for convenience.
【简答题】船舶、设施发生交通事故,应由________查明原因,判明责任。
【简答题】It’s great to receive your email. Now I’d like to tell you something took place in my school yesterday. In the afternoon, we 小题1: _ h______ a growing-up ceremony for our coming 18-year-old ...
【单选题】The chances of the physical sciences being subject to great changes are the biggest because ______.
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in
C.
the direction of their development is difficult to predict
D.
our knowledge of the physical world is inaccurate
【单选题】The chances of the physical sciences being subject to great changes are the biggest because
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in______.
C.
our knowledge of it is highly insecure
D.
only a very small sample of it has been observed
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