方程x2-2x+k=0中,当k______时,方程有两个相等的实数根.

题型:填空题

问题:

方程x2-2x+k=0中,当k______时,方程有两个相等的实数根.

考点:一元二次方程根的判别式
题型:填空题

患者,女性,50岁,因腹痛、呕吐、停止排气排便就诊,尿量600ml/d。查体:血压100/70mmHg,皮肤干燥,眼球下陷,腹胀,肠鸣音亢进,白细胞12×109/L,血清钾3.7mmol/L,血清钠128mmol/L血清氯101mmol/L。

此患者存在的水代谢紊乱是()。

A.等渗性脱水

B.低渗性脱水

C.高渗性脱水

D.水中毒

E.以上全不对

题型:填空题

治疗遗尿伴夜梦多,除主穴外,应加()。

A.肾俞、内关

B.肾俞、肺俞

C.肺俞、足三里

D.百会、神门

E.脾俞、内关

题型:填空题

计算机在现代教育中的主要应用有计算机辅助教学、计算机模拟、多媒体教室和( )。

A.网上教学和电子大学

B.家庭娱乐

C.电子试卷

D.以上都不是

题型:填空题

CO2气体保护半自动焊过程中,手工操作用于完成()。

A.焊接热源的移动

B.焊丝的送入

C.CO2气体的送入

D.熔滴过渡的控制

题型:填空题

The road to controlling population growth in the 20th century was paved with good intentions and unpleasant policies that did not work, a new book argues an historian who grew up as the youngest of eight children might well be expected to approach the question of whether the world is overpopulated from an unusual angle. Matthew Connelly, a professor at Columbia University, dedicates his study of those who thought the planet had too many people and tried to do something about it to his parents, "for having so many children".

Yet, he assures the reader, it Was not his personal experience of large families that drew him to the subject. Mr. Connelly’s mentor, Paul Kennedy of Yale University, believed it was necessary to look beyond great-power rivalries to understand the post-cold-war era. In 1994 the pair wrote an article for Atlantic Mouthly arguing that population growth in poor countries, increasing awareness of global economic inequality and the prospect of mass migration could lead to clashes between the West and "the rest".

When, years later, Mr. Connelly began his own book on population growth, he still thought of the topic as a way to offer a broader understanding of world security. He ended up writing a very different-and angry-book, one about people who looked at the human race reproducing itself and saw what a gardener sees when looking at a prize plant: something to be encouraged to bloom in some places and pruned in others.

As the world population soared, the population controllers came to believe they were fighting a war, and there would be collateral damage. Millions of devices were exported to poor countries although they were known to cause infections and sterility. "Perhaps the individual patient is expendable in the general scheme of things," said a participant at a conference on the devices organized in 1962 by the Population Council, a research institute founded by John [D] Rockefeller, "particularly if the infection she acquires is sterilizing but not lethal. "

Furthermore, statistical estimates suggest that as much as 90% of the reason that women have families of a particular size is simply because that is the number of children they want. Where women gained education and rights, birth rates fell. As with reproduction itself, for people to become less fruitful, desire must precede performance.

Which one of the following is NOT true about Matthew Connelly()

A. He is the youngest of 8 children in the family and grew up to be an historian

B. He is expected to address the population problem from a different perspective

C. His personal experience of large families is the reason why he wants to do research in population

D. He wants to dedicate his research to his parents

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