为减少输尿管镜检查对尿路黏膜的损伤可采取哪些措施

如图所示，间距为L的两条足够长的平行金属导轨MN，PQ与水平面夹角为a，导轨的电阻不计，导轨的N、P端连接一阻值为R的电阻，导轨置于磁感应强度大小为B、方向与导轨平面垂直的匀强磁场中．将一根质量为m、电阻为r的导体棒垂直放在导轨上，导体棒ab恰能保持静止．现给导体棒一个大小为v₀、方向沿导轨平面向下的初速度，然后任其运动，导体棒在运动过程中始终保持与导轨垂直并接触良好．设导体棒所受滑动摩擦力与最大静摩擦力大小相等，求：

（1）导体棒与导轨间的动摩擦因数μ；

（2）在整个运动过程中电阻R上产生的焦耳热；

（3）导体棒在导轨上移动的最大距离．

第二节完形填空（共20小题；每小题1.5分，满分30分）

The simplest way to say it is this: I believe in my mother. My 小题1:  began when I was just a kid. I 小题2: becoming a doctor. My mother was a worker. Through her work, she observed that 小题3: people spent a lot more time reading than they 小题4:  watching television. She announced that my brother and I

小题5:watch two to three TV programs during the week. With our free time, we had to read two books each from the Detroit Public Library and then 小题6: her written book reports. She would mark them up with check marks and highlights. Years later we realized her marks were a 小题7:  . My mother was illiterate (文盲的).

When I entered high school I was an A-student, but not for long. I 小题8:  the fashionable clothes. I wanted to 小题9: the guys. I went from being an A-student to a B-student to a C-student. One night my mother came home after 小题10:  at one of her several jobs and I complained about not having enough Italian knit shirts. She said, “Okay, I’ll give you all the money I make this week scrubbing (擦洗) floors and cleaning bathrooms, and you can buy 小题11:   food and pay the bills. With the money that is 小题12: , you can have all the Italian knit shirts you want.” I was very 小题13:  with that plan, but once I had finished paying for all of the important things, there was 小题14:  left. I realized that my mother was always dealing with money well to be able to 小题15:  a roof over our heads and to put food on the table. I also realized that immediate satisfaction wasn’t going to get me anywhere. _小题16:__ required intellectual (智力的) preparation. I went back to my 小题17:  and became an A-student again. Finally, I 小题18: my dream and I became a doctor. My story is really my mother’s story — a woman with 小题19: formal education who used her position as a parent to change the lives of many people around the globe. Now I believe that there is no job more 小题20:  than parenting.

小题21:

.

A．belief

B．work

C．education

D．promise小题22:

A．kept up with

B．got used to

C．dreamed of

D．got tired of小题23:

A．lazy

B．easy-going

C．successful

D．reliable小题24:

A．cost

B．paid

C．took

D．did小题25:

A．could only

B．could not

C．must not

D．should often小题26:

A．read

B．give

C．hold

D．explain小题27:

A．mystery

B．risk

C．fool

D．trick小题28:

A．wanted

B．attracted

C．recognised

D．accepted小题29:

A．get rid of

B．hang out with

C．test on

D．keep in touch with小题30:

A．serving

B．looking

C．working

D．getting小题31:

A．your brother

B．yourself

C．me

D．the family小题32:

A．left over

B．paid off

C．used up

D．carried out小题33:

A．angry

B．pleased

C．disappointed

D．bored小题34:

A．anything

B．everything

C．something

D．nothing小题35:

A．buy

B．operate

C．keep

D．send小题36:

A．Success

B．Failure

C．Faith

D．Comfort小题37:

A．guys

B．mother

C．studies

D．clothes小题38:

A．made

B．realised

C．changed

D．tried小题39:

A．little

B．much

C．some

D．high小题40:

A．interesting

B．gentle

C．important

D．bitter

2009年2月25日，美众议院通过2009年综合拨款法案规定，不得使用本法所提供的任何拨款进口中国禽肉产品。我国商务部发言人指出，这是典型的歧视性的贸易保护主义做法，中国将向WTO提起诉讼，并保留采取进一步措施的权利。回答19～20题:

小题1:美国众议院通过此法案表明

A．美国政府奉行霸权主义、强权政治的政策

B．国家利益决定外交政策

C．美国是法治国家

D．经济全球化的道路是曲折的小题2:我国商务部发言人的讲话表明

①我国奉行独立自主的和平外交政策                  ②中美关系同而不和

③坚持WTO规则是我国发展对外关系的基本立场        ④我国努力构建和谐世界

A．①②

B．②③

C．①③

D．①④

判断病种，辨别证候的依据是（）

A.症

B.病

C.证

D.证型

E.病案

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