搜题请搜索小程序“爱下问搜题”
问题 选择题

为了儿童安全，布绒玩具必须检测其中是否存在金属断针，可以先将玩具放置在强磁场中，若其中有断针，则断针被磁化，用磁报警装置可以检测到断针的存在．如图所示是磁报警装置中的一部分电路示意图，其中RB是磁敏传感器，它的电阻随断针的出现而减小，a、b接报警器，当传感器RB所在处出现断针时，电流表的电流I、ab两端的电压U将

[ ]

A．I变大，U变大            

B．I变小，U变小

C．I变大，U变小            

D．I变小，U变大

答案

答案：C

填空题

单词拼写.根据下列句子及所缺单词的首字母或汉语意思,写出单词的正确形式.

1. A ________ (化学的) change takes place in paper when it burns.

2. We must r________ ourselves of these old ideas.  

3. Not having had food for over forty hours, we were all weak from h_________.

4. Because of the heavy rain the l________ of the lake has risen 6 inches.

5. It was a new form of ________ (细菌) and nobody knew how it would affect humans.

6. The cookies are made from g________ and fruit.  

7. Farmers consider rabbits to be p________, because they destroy some crops they grow.

8. The violent film is not ________(合适的) for children.

9. This food provides the ________(营养) your dog needs.

10. The average ________(产量) of the factory is 20 cars a day.
查看答案
单项选择题

女，51岁，纳差、消瘦。结合超声声像图，诊断为（）。

A.胰腺癌

B.腹膜后肿块

C.胰岛细胞瘤

D.胃癌

E.胰腺炎
查看答案