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问题 单项选择题

对于亚急性细菌性心内膜炎，下列哪项说法是错误的（）。

A.可引起脏器栓塞症状

B.病原菌多为草绿色链球菌

C.心内膜赘生物以二尖瓣和主动脉瓣最为常见

D.易发生于二尖瓣反流的左心房侧

E.易发生于室间隔缺损的左心室

答案

参考答案：E

单项选择题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues.Imagine receiving an （71） from a friend who asks you to open it. This is what happens with Melissa and several other similar email （72） . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages （73） . As administrators seek to block dangerous email attachments through the recognition of well-known （74） , 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 （75） access to your network.

（71）处填（）。

A．attachment

B．packet

C．datagram

D．message
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多项选择题

采用上拔式液压提升方法适宜整体吊装的构件有（）。

A.投影面积大，重量重的构件

B.投影面积小，提升高度高的构件

C.投影面积小，重量较轻的构件

D.提升高度高，重量较轻的构件

E.提升高度相对较低的构件
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