下列关于栈的叙述正确的是A.栈是非线性结构 B.栈是一种树状结构 C.栈具有先进先出

题型:单项选择题

问题:

下列关于栈的叙述正确的是

A.栈是非线性结构

B.栈是一种树状结构

C.栈具有先进先出的特征

D.栈具有后进先出的特征

考点:计算机等级考试VISUALBASIC二级VISUALBASIC笔试98
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套期保值效果的好坏取决于差价的变化。( )

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Questions 47 to 56 are based on the following passage.
As the world excitedly greeted Snuppy, the first cloned dog, commentators celebrated our cleverness. Many feel proud that our age is marked by technological (47) . But an article in British newspaper The Observer recently said true innovation has (48) from our society.
The writer was Peter Watson, author of the book Ideas — A History from Fire to Freud. Watson began: "The year 2005 can’t begin to compete with 1905 in terms of (49) innovations."
"Writing a history of ideas over the past three ears, I have been (50) time and again by the fact that, contrary to what we tell ourselves all the time-on TV, in newspapers and magazines, in (51) and in government propaganda — our present world is nowhere near as (52) and innovative as it thinks it is, certainly in comparison with past ages."
"Yes, we are dazzled by mobile phones, cameras, digital TV, and the www, by laser- guided surgery and bombs, by DNA fingerprinting, and now by cloning. These are not (53) things but do they change the way we think in important — in fundamental — directions "
Watson quoted Richard Southern, Oxford University historian, who died last year: "Southern thought the most interesting times in history were 1050—1250 and 1750—1950."
"Each of these periods transformed our understanding of ourselves (54) ."
"But what great ideas or transformations have been (55) in the half-century since19507" Watson asked, pointing out that except for a few innovations such as the Internet, most scientific research (56) modifies previous studies.
A) rarely B) introduced C) merelyD) intimate E) distributed
F) important G) advances H) statistics I) radically J) struck
K) disappeared L) small M) interestingN) advertisingO) pessimistic

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已知某温度下,0.1mol/L的NaHB强电解质溶液中,c(H+)>c(OH-),则下列各关系式一定正确的是(  )

A.c(Na+)+c(H+)=c(HB-)+c(B2-)+c(OH-

B.溶液的pH=1

C.c(Na+)=0.1mol/L≥c(B2-

D.c(H+)-c(OH-)=10-14

题型:单项选择题

患者,男性,48岁,乙型肝炎病史10年,因乏力、低热、腹胀、少尿入院。查体:巩膜黄染,腹部膨隆,呈蛙状腹,肝肋下未及,脾肋下2指,移动性浊音阳性。

下列指标中,不能提示肝功能严重损害的是 ()

A.白蛋白明显降低

B.球蛋白明显降低

C.转氨酶明显增高

D.重度黄疸

E.凝血酶原时间延长

题型:单项选择题

企业外部风险可包括()

A.政治风险

B.法律风险

C.社会文化

D.相关方需求

E.以上都是

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