下列运算中结果正确的是（ ） A．a4+a4=a8 B．a3•a2=a6 C．（a2）

阅读理解。

     The high Eiff'el Tower, the colorful streets, the beautiful river Seine, the glorious palaces, the romantic

people,  the old history一Pa.ris is a great place to all the people in the world.

     As the capital of France, Paris is a modern city with a long and rich history. So many events took place here and chere are so many places for the visitors to have a trip.

     The Triumphal Arch(觊旋门)  was finished in 1836.  It's a world famous build-

ing, too.  The Eiffel Tower(埃菲尔铁塔) , which is 320 meters high, is the symbol of

Paris.  It was completed in 1889. The Eiffel Tower is located on the left bank of the River Seine, at the

northwestern extreme of the Parc du Champ de Mars.  The Tower is repainted every 7 years, with 50

tonsof paint.

根据短文内容，判断下列句子的正误，正确的用A表示，错误的用B表示。

(      )l. Paris is really a good place to visit for only French people.

(      )2. Paris, the capital of England, has a long and rich history.

(      )3.The Triumphal Arch which has a more than 200 years' history is a good place to visit in Paris.

(      )4. Eiffel Tower, which is 320 meters high, is the highest symbol of Paris.

(      )5. Every seven years, the Eiffel Tower is repainted.

某同学利用如图装置研究磁铁下落过程中的重力势能与电能之间的相互转化．内阻r=40Ω的螺线管固定在铁架台上，线圈与电流传感器、电压传感器和滑动变阻器连接．滑动变阻器最大阻值40Ω，初始时滑片位于正中间20Ω的位置．打开传感器，将质量m=0.01kg的磁铁置于螺线管正上方静止释放，磁铁上表面为N极．穿过螺线管后掉落到海绵垫上并静止（磁铁下落中受到的阻力远小于磁铁重力，不发生转动），释放点到海绵垫高度差h=0.25m．计算机屏幕上显示出如图的UI-t曲线．

（1）磁铁穿过螺线管过程中，螺线管产生的感应电动势最大值约为______V．

（2）（多选题）图象中UI出现前后两个峰值，对比实验过程发现，这两个峰值是在磁铁刚进入螺线管内部和刚从内部出来时产生的，对这一现象相关说法正确的是______

（A）线圈中的磁通量经历先增大后减小的过程

（B）如果仅略减小h，两个峰值都会减小

（C）如果仅略减小h，两个峰值可能会相等

（D）如果仅移动滑片，增大滑动变阻器阻值，两个峰值都会增大

（3）在磁铁下降h=0.25m的过程中，可估算重力势能转化为电能的效率是______．

同情和开导病人属于（）

A.药物治疗中的道德要求

B.手术治疗中的道德要求

C.手术后的道德要求

D.心理治疗的道德要求

E.辅助治疗的道德要求

煤样制备共有四大程序，分别是破碎、筛分、掺和和干燥。

舌短缩，色淡或青紫而湿润属于（）

A.寒凝筋脉

B.痰浊内阻

C.痰阻舌络

D.热极伤津

E.气血两虚