法国和德国的科学家费尔和格林贝格尔由于发现了巨磁电阻(GMR)效应,荣获了200

题型:选择题

问题:

法国和德国的科学家费尔和格林贝格尔由于发现了巨磁电阻(GMR)效应,荣获了2007年诺贝尔物理学奖,如图所示的是研究巨磁电阻特性的电路示意图,当闭合S1、S2后,使滑片P向左滑动的过程中,指示灯明显变亮,则下列说法正确的是

A.滑片P向左滑动过程中电磁铁的磁性减弱

B.滑片P向左滑动过程中电磁铁的磁性增强

C.磁场随巨磁电阻阻值的减小而增大

D.巨磁电阻的阻值随磁场的增强而明显增大

考点:电阻的定义
题型:选择题
Chinese space lover Wang Yuan has been chosen as one of the volunteers for the Mars-500 test project.   小题1:   Another five volunteers are all space . They are three Russians, an Italy-Colombian and a Frenchman. They will feel what it's like to travel to Mars without leaving the earth. During the whole process (过程), they are locked up for one and a half years under the condition which is similar to the red planet. So the experiment is called Mare-500.
   小题2:  Although the volunteers won't leave the building, they will feel as if(好像) they are on a real trip to Mars. The most difficult thing is that they will be separated from he people outside.  小题3:  That will be hard. When reporters asked what they would miss most during the 500-day special life, Charles from France said, "For me, it will be mainly my family, the sun and fresh air."
The main task is to study "Man and Environment". It will care about the astronauts' physical
effects and the experience of staying there. 小题4:  So they will have to make decisions by themselves and then report to the earth, and the earth will tell them whether they do the right thing or not.
Each astronaut is preparing for the great challenge. And people are looking forward to the result of the experiment.
A. Everyone will stay and work there alone.
B. For 18 months, they won't see sunsets or sunrises.
C. The Mars-500 test will be in a special building in Moscow.
D. He was very happy to be chosen and will accept the challenge.
 
小题5:According to the passage, which of the following is TRUE?
A.Five space lovers were chosen as volunteers.
B.The Mars-500 test will take place in Paris.
C.The volunteers will face many sorts of difficulties.
D.The Mars-500 test is about a real trip to Mars.
题型:选择题

下列生物所代表的类群正确的是(  )

A.蚯蚓--节肢动物

B.白鳍豚--鱼类

C.向日葵--被子植物

D.葫芦藓--蕨类植物

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现今大多数的超级市场提供的产品和服务几乎是标准化的,客户只能根据其提供的标准来选择满足自身需求,这种方式属于C.RM战略中的哪一种()?

A.拉链式战略

B.互动式战略

C.扣钩式战略

D.维可牢战略

题型:选择题

以下属于《内经》九针的针具有()

A.圆针

B.锋针

C.大针

D.长针

E.皮内针

题型:选择题

在营养学中,矿物质是指( )

A.金属元素

B.宏量元素

C.微量元素

D.微量元素、宏量元素

E.金属元素、微量元素

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