如图所示,a、b两根垂直纸面的直导体通有等值的电流,两导线旁有一点P,P点到a、

题型:不定项选择

问题:

如图所示,a、b两根垂直纸面的直导体通有等值的电流,两导线旁有一点P,P点到a、b距离相等,要使P点的磁场方向向右,则a、b中电流的方向为

[ ]

A.都向纸内

B.都向纸外

C.a中电流方向向纸外,b中向纸内

D.a中电流方向向纸内,b中向纸外

考点:电流的磁场,安培定则
题型:不定项选择

根据语境,用恰当的语言完成对话。

(The entrance exam for secondary school (中考)is over. The summer holiday is coming. Now Peng Lan is talking to Liu Qiang happily at home.)

Peng Lan=P      Liu Qiang=L

P: Hey, Liu Qiang. Our junior high school life has come to an end. What are you going to do this summer vacation?

L: 小题1:__________________________________. The scenery there is very beautiful.

P: Sounds great. It’s considered as the Treasure Island of China. 小题2:______________________?

L: I’ll go to Mount Ali, Sun Moon Lake and some other tourist attractions. And I want to see Tuantuan and Yuanyuan.

P: 小题3:____________________________________________?

L: By ship. You know the policy is much better than before. People from the mainland can fly or take a ship there. I prefer to go there by ship.

P: 小题4:_____________________________. It’s a little more slowly but interesting. Well, it’s reported the farmers can sell their fruits to the mainland. It not only helps the farmersf earn money, but also makes a contribution to the communication between Taiwan and the mainland.

L: That’s right. I hope our country can unite early.

P: Me, too. 小题5:_________________________________________?

L: In half a month. My parents will go with me.

P: Well, don’t forget to bring back some various delicious fruits from Taiwan.

L: Of course not.

题型:不定项选择

“基督教的理想是扩张的凝结剂,使各种各样世俗的要求罩上神圣的光圈,不管是到东方来的达·伽马还是到西方去的哥伦布,都是把宗教目标和现实目标糅合在一起,无法区分。”这段话表明新航路开辟中[ ]

A.宗教狂热成为探险家的精神动力

B.教皇发挥了组织作用

C.传播基督教是探险家的主要目的

D.教会蜕变成殖民机构

题型:不定项选择

翻译句子

1.我家里有许多种书籍.

                               

2.他由于种种原因而离开.

                            

3. This city is noted for its various bridges.

                                          

题型:不定项选择

关于低血钾性周期性瘫痪,叙述正确的有()

A.均有家族史

B.儿科常见于学龄儿童

C.女性多见

D.饱食、寒冷或过度疲劳易诱发

E.感觉正常,意识清楚

题型:不定项选择

联合国环境计划署的数据显示,臭氧层每减少1%,具有生理破坏力的紫外线就增加()。

A、5%

B、4.2%

C、3.1%

D、1.3%

更多题库