设备的“三态”是指()、()、()。

题型:填空题

问题:

设备的“三态”是指()、()、()。

考点:循环水操作工循环水操作工题库
题型:填空题

以下事物中氟含量排列正确的是()

A.水果>调味剂

B.骨骼>表皮>腺体

C.水果>空气>土壤

D.动物>植物>空气

E.茶叶>海鱼

题型:填空题

下列哪种传染病的时间分布一般呈严格的季节性()。

A.虫媒传染病

B.寄生虫病

C.肠道传染病

D.呼吸道传染病

E.血液传染病

题型:填空题

氯丁橡胶是由()经乳液聚合而成。

A.氯丁二烯

B.丁二烯

C.乙烯

D.丁烷

题型:填空题

自然地理环境各要素通过水循环、大气循环、生物循环和岩石圈物质循环等过程,进行着物质迁移和能量交换,形成了一个相互渗透、相互制约和相互联系的整体。

如果此图表示的是北半球某特大城市的热力环流,则()

A.为保护城市环境,应在③地建防护林带

B.a是城市’b是郊区

C.若a位于b的正西方,则a、b间实际风向为西南风

D.这种大气环流能有效防止城市的大气污染

题型:填空题

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (46) from a friend who asks you to open it. This is what happens with Melissa and several other similar E-mail (47) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (48) .

A. namesB. cookies C. software D. extensions

As administrators seek to block dangerous email attachments through the recognition of well-known (49) , 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 (50) access to your network.

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