工业企业用地中的建筑系数，是指厂区内（）与厂区用地面积之比。

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问题单项选择题

A．建筑物及构筑物用地面积之和

B．建筑物、构筑物及露天设备用地面积之和

C．建筑物、构筑物、露天设备用地及露天堆场用地面积之和

D．建筑物、构筑物、露天设备用地、露天堆场用地及露天操作场用地面积之和

答案

参考答案：D

解析：

本题中，建筑系数

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.

A．virtual

B．virus

C．worms

D．bacteria

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问答题简答题

三段抽汽设有哪些疏水点？排至何处？

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