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问题 单项选择题

设有定义int a=1；float f=1．2；charc=''a''；，则下列表示错误的是（ ）。

A． ++a；

B． f--；

C． c++；

D．8++；

答案

参考答案：D

解析：++，--运算符不能用于常量表达式。

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (6) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (7) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (8) .

As administrators seek to block dangerous email attachments through the recognition of well-known (9) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (10) access to your network.

（9）是（）

A.names

B.cookies

C.software

D.extensions
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单项选择题 A1/A2型题

下列关于脉冲短波的说法中，错误的是（）

A.可以促进组织愈合

B.主要产生非热效应

C.不可用于术后

D.能量低，无烧伤危险

E.可起到消炎作用
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