下列关于栈的描述正确的是______。A.在栈中只能插入元素而不能删除元素 B.

题型:单项选择题

问题:

下列关于栈的描述正确的是______。

A.在栈中只能插入元素而不能删除元素

B.在栈中只能删除元素而不能插入元素

C.栈是特殊的线性表,只能在一端插入或删除元素

D.栈是特殊的线性表,只能在一端插入元素,而在另一端删除元素

考点:计算机等级考试VISUALFOXPRO计算机二级(VF)51
题型:单项选择题

闭上眼睛用于触摸蚯蚓,能感觉到区分其背腹的结构______,其作用______区分其前后的结构______,感觉是______.

题型:单项选择题

第Ⅱ卷(共35分)
第四部分:写作(共两节,满分35分)
第一节:对话填空(共10小题,每小题1分,满分10分)
请认真阅读下面对话,并根据各题所给字母的提示,在标有题号的右边横线上写出一个英语单词的完整、正确的形式,使对话通顺。
D="David     " P=Peter
D: Peter , ten years ago you wanted to become a doctor . . .
P: Yeah , but unfortunately I didn’t (76)m       the requirements .
D: So what did you do then ?
P: Well , I was very (77) d       , but I just had to move on and do something else with my life . So I took a year off and worked as a volunteer on an aid program . That made me realize (78)h       important it is to raise money to help people (79)l       a poor life . So that’s what I do .
D: Can you explain a bit more about what you (80)a       do ?
P: I go to see people , put (81)f       our suggestion and organize activities to collect money .
D: So have you (82)a_____any of your goals ?
P: Well , I guess so . I always said I wanted to help (83)o       people .
D: And what about your plan for the (84)f       ?
P: My girlfriend and I intend to get married next year .
D: (85)C_____!
 
76.           
77.           
78.           
79.           
80.            81.           
82.            83.           
84.           
85.           
题型:单项选择题

一类高层建筑自备发电设备,应设有自动启动装置,并能在( )内供电。

A.15s

B.20s

C.25s

D.30s

题型:单项选择题

为了使整流电路可控,要求阻容移相触发电路输出信号U二与主电路电压U,的相位关系为()。

A.Usc超前Uab

B.Usc滞后Uab

C.Usc与Uab同相序

D.Usc与Uab同相位

题型:单项选择题

试简述锅内水处理的防垢对策?

 

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