在1000名60岁以上男性中进行前列腺特异抗原(PSA)测定,该人群前列腺癌的现患率

题型:单项选择题

问题:

在1000名60岁以上男性中进行前列腺特异抗原(PSA)测定,该人群前列腺癌的现患率为10%,测定人群中有70例前列腺病人PSA检查异常。该资料能否计算PSA检查的灵敏度()。

A.不能,因为没有非患者人数

B.不能,因为没有患者人数

C.能,因为可计算患者人数

D.能,因为可计算非患者人数

E.以上都不对

考点:疾病控制(医学高级)疾病控制综合练习疾病控制综合练习题库
题型:单项选择题

     ①我叫爬山虎,在植物分类中属葡萄科。我的卷须顶端长有吸盘,使我成为爬山爬墙的好手。  

       ②我占地少,生长快,覆盖面积大。我国不少城市绿化覆盖率较小,房屋毗连,空地较少,大量开辟庭院的可能性较小。例如上海市区人均公共绿地面积目前只有0.96平方米,绿地覆盖率只有11.7%。而我只需利用围墙一角,便能生根发芽,攀墙生长,一根茎粗2厘米的藤条,种植2年,墙面的绿化覆盖面积便可达30至50平方米,三四年后,我能把整幢房屋的墙面爬满。  

       ③我在环境保护中发挥着多方面的作用。我的叶片较大、呈广卵形。宽10至20厘米。炎夏,从根部吸收的水分经叶片蒸腾,可带走空气中的热量,降低环境温度。我的茎叶密集,覆盖在房屋墙面上,可以遮挡强烈的阳光,又可以使空气在叶片与墙面之间流动,因而降低室内温度。我的卷须式吸盘能吸收墙上的水分,有助于潮湿房屋的干燥;而干燥季节,有我遮蔽墙面,又可以保持房屋的湿度。我的绿叶能制氧,是空气中氧气的一个重要来源。我的枝叶攀缘在围墙,房屋的墙面上,可以吸收环境中的噪音,还能吸附飞扬的尘土。  

       ④[   ]我在一般土壤中都能生长。我喜阳,又较耐阴,耐干旱,种植后一般不需管理,只是在夏委久旱不雨、土壤过干时,浇些水就可以了。我既可地栽,又宜盆植、播种、压条、扦插都能繁殖生长,但最简单的是扦插。早春时剪取藤枝一段,直接插入土中,5月中旬就能生长发芽,倚墙攀缘。不久,我便能送给您一片绿荫。

1.爬山虎善于爬山爬墙的原因是___________________________________。

2.简要写出爬山虎能降低室内温度的两个原因: 

     (1)___________________________________________ 

     (2) __________________________________________

3.对第②段运用的说明方法,理解正确的一项是:[ ]

     A.举例子 下定义  

     B.作比较 打比喻 

     C.举例子 列数字  

     D.分类别 作比较

4.根据第③段的内容填空:__________________________________________ 爬山虎在环境保护中的作用有:(1)降低温度;(2)______;(3)______;(4)_____噪音;(5)_____尘土。

5.第④段[  ]内应填入的最恰当的一句话是:[ ]

      A.我耐干旱。         

      B.我的繁殖方法多种多样。

      C.我生性随和,适应性强。  

      D.我能给您送上一片绿荫。

6.第②段“便可达30至50平方米”中的“至”能不能改为“或”?为什么?

                                                                                                                                                         

题型:单项选择题

Like many of my generation, I have a weakness for hero worship. At some point, however, we all to question our heroes and our need for them. This leads us to ask: What is a hero

Despite immense differences in cultures, heroes around the world generally share a number of characteristics that instruct and inspire people.

A hero does something worth talking about. A hero has a story of adventure to tell and community who will listen. But a hero goes beyond mere fame.

Heroes serve powers or principles larger than themselves. Like high-voltage transformers, heroes take the energy of higher powers and step it down so that it can be used by ordinary people.

The hero lives a life worthy of imitation. Those who imitate a genuine hero experience life with new depth, enthusiasm, and meaning. A sure test for would-be heroes is what or whom do they serve What are they willing to live and die for The answer or evidence suggests they serve only their own fame, they may be famous persons but not heroes. Madonna and Michael Jackson are famous, but who would claim that their fans find life more abundant

Heroes are catalysts (催化剂) for change. They have a vision from the mountaintop. They have the skill and the charm to move the masses. They create new possibilities. Without Gandhi, India might still be part of the British Empire. Without Rosa Parks and Martin Luther King, Jr., we might still have segregated (隔离的) buses, restaurants, and parks. It may be possible for largescale change to occur without leaders with magnetic personalities, but the pace of change would be slow, the vision uncertain, and the committee meetings endless.

Madonna and Michael Jackson are not considered heroes because ().

A. they are popular only among certain groups of people

B. their performances do not improve their fans morally

C. their primary concern is their own financial interests

D. they are not clear about the principles they should follow

题型:单项选择题

F344/N与()小鼠相同,均可作为视网膜退化的模型。

A、CBA/J

B、NZB

C、A/J

D、DBA/2

题型:单项选择题

赵某,女,27岁。2天前外阴部忽然肿胀疼痛,近日红肿加重,疼痛加剧,痛不可忍,发热心烦,便秘尿黄,舌红苔黄腻,脉滑数。

治法为()

A.清热解毒,利湿消疮

B.清热解毒,化瘀敛疮

C.清热养阴敛疮

D.温经活血化瘀

E.清热利湿敛疮

题型:单项选择题

设AND、OR和NOT分别表示按位与、按位或和按位求反运算,且X=10011011,Y= 01111010,Z:11101000,贝rJ(NOT(X)ANDY); (9) ,(YORNOT(Z)): (10)

A.10011011

B.01111010

C.11101000

D.01100000

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