测定柴油的十六烷值时,人为地选择了标准物,其中一种为(),它的抗爆性好,规定其十六烷

题型:单项选择题

问题:

测定柴油的十六烷值时,人为地选择了标准物,其中一种为(),它的抗爆性好,规定其十六烷值为100.

A、异十六烷

B、正十六烷

C、异辛烷

D、α-甲基苯

考点:油品计量工考试初级油品计量工初级油品计量工题库
题型:单项选择题

5岁患儿,发热、头痛、呕吐10天,病后易激惹。查体:消瘦、颈强,心肺听诊未见异常。凯尔尼格征(克氏征)、布氏征及双侧巴氏征阴性。脑脊液检查:外观较清亮,白细胞20×109/L,蛋白增高,糖及氯化物降低。首先考虑的诊断()。

A.脑脓肿

B.病毒性脑膜炎

C.结核性脑膜炎

D.细菌性脑膜炎

E.中毒性脑病

题型:单项选择题

今年3月22日至28日是中国水周,我市有关部门呼吁广大市民“像北方缺水城市一样珍惜水资源”,下列做法中不利于节约水资源的是(  )

A.

淋浴擦肥皂时暂时关上喷头

B.

洗衣后的水用来拖地

C.

水龙头坏了,立即修理

D.

用水管不间断地冲洗汽车

题型:单项选择题

Battles are like marriages. They have certain fundamental experience they share in common; they differ infinitely, but still they are all alike. A battle seems to me a conflict of wills to the death in the same way that a marriage of love is the identification of two human beings to the end of the creation of life—as death is the reverse of life, and love of hate. Battles are commitments to cause death as marriages are commitments to create life. Whether, for any individual, either union results in death or in the creation of new life, each risks it—and in the risk commits himself.
As the servants of death, battles will always remain horrible. Those who are fascinated by them are being fascinated by death. There is no battle aim worthy of the name except that of ending all battles. Any other conception is, literally, suicidal. The fascist worship of battle is a suicidal drive; it is love of death instead of life.
In the same idiom, to triumph in battle over the forces which are fighting for death is-again literally-to triumph over death. It is a surgeon’s triumph as he cuts a body and bloodies his hands in removing a cancer in order to triumph over the death that is in the body.
In these thoughts I have found my own peace, and I return to an army that fights death and cynicism in the name of life and hope. It is a good army. Believe in it.

Although the author says that battles are horrible, he also says that______.

A.most people find fascination in them

B.there is no battle aim worthy of the name

C.one should love life and not death

D.fighting to end battles is justifiable

题型:单项选择题

在黑暗条件下,细胞分裂素可延缓成熟绿叶中叶绿素的降解,表明细胞分裂素能()。

A.延缓叶片变黄

B.促进叶片衰老

C.在成熟的叶肉细胞中合成

D.独立调节叶绿素降解的生理过程

题型:单项选择题

根据其安全性及可靠性,目前常用的产前染色体核型分析的诊断方法是

A.绒毛活检术
B.羊膜腔穿刺术
C.经皮脐血穿刺术
D.胎儿镜检查
E.胚胎植入前诊断

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