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【单选题】
$a_1=\sqrt{2},a_2=\sqrt{2+\sqrt{2}},\dots,a_n=\sqrt{2+a_{n-1}}$
当$n \rightarrow \infty$时极限
A.
存在
B.
不存在
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三
淬火钢高温回火后得到()组织。
A.
回火索氏体
B.
回火托氏体
C.
回火马氏体
D.
以上说法都不对
常用的高温退火工艺包括()。
A.
均匀化退火
B.
球化退火
C.
再结晶退火
D.
完全退火
钢的表面淬火加热方法包括()。
A.
工频感应加热
B.
低频感应加热
C.
高频感应加热
D.
中频感应加热
You can remove applications from Windows from the( )
A.
Device Manage
B.
Taskbar
C.
Dock
D.
Control Panel
()refers to applications by the same manufacturer purchased as a group.
A.
Desktop publishing software
B.
System requirements
C.
Legal software
D.
A suite
What is the area immediately to the left of the clock in the taskbar
A.
application area
B.
notification area
C.
pin area
D.
Start box
钢的淬透性大小通常用()来表示。
A.
淬透层深度
B.
淬透性曲线
C.
临界淬透直径
D.
淬透层硬度
抗体对病毒的中和作用主要表现在
A.
中和病毒毒素
B.
抑制病毒生物合成
C.
阻止病毒与靶细胞相互作用
D.
诱导干扰素产生
切削热的传导途径()
A.
周围介质
B.
切屑
C.
刀具
D.
工件
The main drawback to an inkjet printer is:
A.
high cost per page
B.
does not print graphics
C.
high initial cost
D.
does not print in color
The scanning technology used by banks to read the routing numbers on checks is().
A.
magnetic-ink character recognition (MICR)
B.
magnetic card reader (MCR)
C.
optical mark recognition (OMR)
D.
Universal Product Code (UPC)
下列关于磨损的描述,哪些是正确的( )。
A.
C 耐磨性可用磨损量来表示。
B.
A 接触疲劳与磨损无关。
C.
D 在磨损过程中,磨损类型会发生转化。
D.
B 摩擦和磨损相生相伴。
截止2022年底,世界上在建的最大跨径的悬索桥是:
A.
中国张靖皋长江大桥
B.
土耳其1915恰纳卡莱大桥
C.
日本明石海峡大桥
D.
中国仙新路过江通道
机床夹具组成部分有
A.
定位元件及定位装置
B.
夹具体
C.
对刀及导向元件
D.
夹紧元件及夹紧装置
只有在 精度很高时,重复定位才允许采用,且有利于增加工件的刚度
A.
工序基准和定位元件
B.
夹紧机构
C.
定位基准和定位元件
D.
设计基准和定位元件
Which option would you select in Internet Explorer to remove any trace of previously visited websites?
A.
Update Browsing History on Exit.
B.
Remove Browsing History on Exit.
C.
Refresh Browsing History on Exit.
D.
Delete Browsing History on Exit.
Which of the following statements about“Disposable income”is incorrect?
A.
It is total personal income minus personal current taxes.
B.
It is not the same with discretionary income.
C.
It is total personal income after subtracting taxes and typical expenses.
D.
It is total personal income minus all payments that are necessary to meet current bills.
Hard disk is ().
A.
Output equipment
B.
Read only memory
C.
External memory
D.
Internal memory
Which would be an appropriate use of a forum?
A.
Check to see if there are known problems with a device.
B.
Transfer a file.
C.
Communicate privately with a teacher.
D.
Request a refund for a purchase.
What should you do if you receive an email telling you that you have won a competition you did not enter?
A.
Contact the sender of the email and tell him he has made a mistake.
B.
Open the message to see if the prize is worth claiming.
C.
Open the message and claim the prize.
D.
Delete the mail immediately.
The main function of the controller is ().
A.
Make logical judgment
B.
Arithmetic operation on data
C.
Input and output of control data
D.
Command all parts of the computer to work automatically and coordinately
Data stored in ROM when the computer is powered off ().
A.
Will not lose
B.
Partial loss
C.
May be lost
D.
Completely lost
which of the following is the correct email?
A.
@qq.com
B.
abc@.com
C.
abc@163.com
D.
abc@qq
WPS, word and other word processing software belong to().
A.
Management software
B.
Application software
C.
Network software
D.
System software
加工企业内销( ),不需征缓税利息。
A.
受灾保税货物
B.
保税加工过程中产生的边角料
C.
保税加工料件、剩余料件
D.
保税加工制成品、残次品
下列不属于调理肉制品的是()
A.
冷藏调理肉制品
B.
调理食品
C.
预调制调理肉制品
D.
预加热调理肉制品
调理肉制品按其加工工艺分为预制调理肉制品和()
A.
预加热调理肉制品
B.
冷藏调理肉制品
C.
调理肉制品
D.
冷冻调理肉制品
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B.
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The reason for doing something.
B.
Something happens in that way or has the result the consequence of something.
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The potential risk of doing something.
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The original plan of doing something.
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A.
The balance factor of each node falls within [-1, 1] 每个节点的平衡因子的绝对值不超过1
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【多选题】好的选题从哪里来?
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知己知彼:你对一个领域的了解程度会直接影响你的选题
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长期思考:有的问题需要多年的思考
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宽广胸怀:一个人的出发点直接决定了选题可能的高度
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好的选题非一日之功
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A.
$ \{x|x\in (0,1),x\in Q\} $
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自然数集
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有限个数构成的集合$ \{a_1,a_2,\cdots,a_n\} $
D.
$ \{x\in R|x^2-2x-3 < 0\}$
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$[-1,0)$
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$(-\infty ,0]$
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$( - \infty ,0] \cup [2, + \infty ) $
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$\frac{{a + b + |a - b|}}{2},\frac{{a + b - |a - b|}}{2} $
B.
$\frac{{a - b + |a - b|}}{2},\frac{{a + b - |a - b|}}{2} $
C.
$\frac{{a + b - |a - b|}}{2},\frac{{a - b + |a - b|}}{2}$
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$\frac{{a + b + |a - b|}}{2},\frac{{a - b + |a - b|}}{2} $
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the root is red 根节点为红色
B.
both the root and the external nodes are red 根节点和外部节点都为红色
C.
both a parent and its child are red 相邻的两个父子节点都为红色
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there are two red nodes in the tree 树中有两个红色节点
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Lack of vitality.
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