已知x=1是关于x的一元二次方程2x2+kx-1 = 0的一个根,则实数k的值是

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问题:

已知x=1是关于x的一元二次方程2x2+kx-1 = 0的一个根,则实数k的值是   

考点:一元二次方程的定义一元二次方程的解法
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结核菌素试验有助于下列哪个疾病的诊断()。

A.营养不良

B.佝偻病

C.糖尿病

D.结核病

E.肾脏病

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简述如何评估患者的活动能力。

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关于角膜映光法下列说法正确的是()

A.用于判断有无斜视,并估计斜视角

B.用于判断有无斜视,不包括隐斜视,并估计斜视角

C.用于判断有无麻痹性斜视

D.用于判断有无隐斜视

E.以上都不正确

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The nobler and more perfect a thing is, the later and slower it is becoming mature. A man reaches the mature (1) of his reasoning powers and mental faculties (2) before the age of twenty-eight; a woman at eighteen. And then, too, in the case of woman, it is the only reason of a sort--very mean in its (3) . That is why women remain children their whole life long; never seeing (4) but what is quite close to them, (5) fast to the present moment, taking appearance for (6) , and preferring (7) to matters of the first importance. For it is (8) his reasoning faculty that man does not live in the present only, (9) the brute, but looks about him and considers the past and the future; and this is the origin of (10) , as well as that of care and anxiety which so many people (11) Both the advantages and the disadvantages, which this (12) , are (13) in by the woman to a smaller extent because of her weaker power of reasoning. She may, in fact, be described as intellectually shortsighted, (14) , while she has an immediate understanding of what lies quite close to her, her field of (15) is narrow and does not reach to what is (16) ; so that things which are absent, or past, or to come, have much less effect upon women than upon men. This is the reason why women are inclined to be (17) and sometimes carry their desire to a (18) that borders upon madness. In their hearts, women think it is men’s business to earn money and theirs to spend it--if possible during their husband’s life, (19) , at any rate, after his death. The very fact that their husband hands them (20) his earnings for purposes of housekeeping strengthens them in this belief.

8()

A. at the mercy of

B. with regard to

C. in the interests of

D. by virtue of

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水准仪主要由()主要部分组成,是为水准测量提供水平视线和对水准标尺进行读数的一种仪器。

A.望远镜

B.水平度盘

C.水准器

D.基座

E.照准部

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