A more effective approach to controlling spam ha been the development and use of spam blockers, also known as ________.
A: spam
B: spam filters
C: antivirus
D: e-mail system
A: spam
B: spam filters
C: antivirus
D: e-mail system
举一反三
- What is spam? Spam is _____ email.
- 执行以下代码的结果是：spam = 'hello' spam + 'world' print(spam)
- 有以下代码L = ('spam', 'Spam', 'SPAM!')下面那项是不正确的 A: L[2] 'SPAM!' 读取第三个元素 B: L[-2] 'Spam' 反向读取,读取倒数第二个元素 C: L[1:] ('Spam', 'SPAM!') 截取后2个元素 D: L[0:1] ('Spam', ') 截取中间的第2个元素
- 1. spam 2. firewall 3. virus 4. antivirus
- 以下程序执行后的结果是：spam=40 spam=spam+2 print(spam) A: 42 B: 40 C: error D: 2