如图所示的电路中,电源电压保持不变,小灯泡L上标有“6V 3W”,闭合开关S,将

题型:填空题

问题:

如图所示的电路中,电源电压保持不变,小灯泡L上标有“6V 3W”,闭合开关S,将滑动变阻器的滑片P置于中点c时,灯泡L恰好正常发光,当滑片P置于最左端a时,电流表的示数是0.3A,则滑动变阻器的最大阻值是_______Ω。电源电压是_______V。(不考虑温度对灯丝电阻的影响。)

考点:欧姆定律及其应用
题型:填空题

阅读理解。

     No matter what he is doing, every human being gives body heat. The usual problem is how to dispose

of it. But the designers of the Johnstown campus of the university of Pittsburg set themselves the opposite

problem-how to collect body heat. They have designed a collection system which uses not only body heat

but also the heat given off by such objects as light bulbs and refrigerators as well. The system works so

well that no conventional fuel is needed to make the campus's six buildings comfortable.

     Some parts of most modern buildings-theatres and offices as well as classrooms-are more than heated

by people and lights and sometimes must be air-conditioned even in the winter. The technique of saving

and redistributing it is called "heat recovery". A few modern buildings recover heat, but the university's

system is the first to recover heat from some buildings and reuse it in others.

     Along the way, Pitt has learned a great deal about some of its heat producers. The harder a student

studies, the more heat his body gives off. Male students emit more heat than female students, and the larger

a student, the more heat he produces. It is tempting to conclude that the hottest prospect for the Johnstown

campus would be a hard-working, overweight male genius.

1. The underlined words "dispose of" in the first paragraph mean _____.

A. reuse

B. collect

C. get rid of

D. place in suitable positions

2. According to the passage,the following statements are true EXCEPT _____.

A. fat,male and hard-working students give off more heat

B. six buildings are heated by the heat system on the Johnstown campus

C. the heat is supplied by human bodies, other heat-omitting objects

D. the heat from human bodies, other heat-omitting objects is only used in cold winter

3. From the passage, we can infer that _____ would produce the LEAST heat.

A. a large female who does not study hard

B. a thin male who studies hard

C. a thin female who does not study hard

D. a large male who studies hard

4. The underlined sentence is _____.

A. indifferent

B. objective

C. serious

D. humorous

题型:填空题

按照安全评价给出的定量结果的类别不同,定量安全评价方法不包括( )。

A.危险指数评价法

B.伤害(或破坏)范围评价法

C.概率风险评价法

D.设备(设施或工艺)故障率评价法

题型:填空题

对不需要国家资金补贴的分布式光伏发电项目,如具备接入电网运行条件,可放开规模建设。

题型:填空题

在中兴DWDM系统中,实现APS协议处理的单板是()

A、OSC

B、OBA

C、OPA

D、NCP

题型:填空题

小鸟游六花的中二属性是什么?()

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