在做“描绘小灯泡的伏安特性曲线”实验时,所用器材有:电动势为6V的电源,额定电压

题型:实验题

问题:

在做“描绘小灯泡的伏安特性曲线”实验时,所用器材有:电动势为6V的电源,额定电压为2.5V的小灯泡,以及符合实验要求的滑动变阻器、电表、开关和导线。要求能测出尽可能多组数据,如图是没有连接完的实物电路。(已连接好的导线有a、b、c、d、e、f六根)

(1)请你用笔画线代替导线,将实物电路连接完整;

(2)排除故障后比和开关,移动滑片P到某处,电压表的示数为2.2V,在要测量小灯泡的额定功率,应将滑片P向__________端滑动(选填“左”“右”);

(3)通过移动滑片P,分别记下了多组对应的电压表和电流表的读数,并绘制成了如图所示的U-I图线。根据U-I图线提供的信息,可计算出小灯泡的额定功率是_________W。

(4)图线是曲线而不是过原点的直线,原因是____________________。

考点:实验:测绘小灯泡的伏安特性曲线
题型:实验题

This is a true story in Guyuna. One day, a child took some silver(银的)paper from a cigarette box. He rolled it into a tiny(极小的)ball and pushed it up his nose. He couldn’t get it out again. He ran crying to his mother. His mother couldn’t get the paper out, either. A week later the paper was still in his nose. His nose began to have a bad smell.

So his mother took her child to the hospital. The doctor looked up his nose. She put a tiny steel rod(钢棒)into his nose and felt the paper. She said she would have to cut his nose to get the paper out.

The child’s mother came home looking sad. She didn’t want her child to have his nose cut. He was a handsome boy and the cut would make him ugly.

Next day, the child’s mother took him to her friend Sidney. Sidney lived in a house with an old woman called May. She asked to see the child, so the child let her look up his nose. He closed his eyes.

“Yes, I can see it,” May said, “It will be out soon!”

As she spoke, she shook black pepper(胡椒粉) on the child’s nose. He gave a mightly(有力的)sneeze and the paper flew out. His mother was surprised. May told her to take the boy to the sea for a swim. She said the salt water would go up his nose and stop the bad smell.

So the child didn’t have to go to the hospital and gave his nose out.

小题1: How did the silver ball go into the boy’s nose?

A.His mother put it into his nose.

B.The boy himself pushed the ball up his nose.

C.The silver ball rolled into his nose itself.

D.The passage didn’t tell us.小题2:. Why did the boy’s nose have a bad smell?

A.The ball stayed in his nose for too long.

B.The boy didn’t like to wash his nose.

C.His nose is cut and gave a bad smell.

D.Because he had a running nose.小题3:. What can help to stop the bad smell?

A.Some medicine

B.Some black pepper

C.Fresh air

D.The salt water小题4:. Who helped to take the silver ball out?

A.The boy himself

B.The doctor

C.Sidney

D.May小题5:. What is the best title of the story?

A.Old medicine

B.Some good doctors

C.A poor boy

D.A silver ball

题型:实验题

使用和看管炸药的所有人员,包括()必须熟悉爆炸物品的性能和危险隐患,应接受过正规培训。

A、炸药库看守

B、运送炸药的卡车司机

C、爆炸工

D、以上都是

题型:实验题

建筑功能评价,就是对建筑产品能够提供的( )加以分析和评价论证,衡量其满足社会需要的程度。

A.功能效果

B.使用功能

C.艺术效果

D.价值大小

题型:实验题

未规定规格的所有商品,可在规定的容量规格范围内选择使用,规格的尾数是()。

A、0

B、1

C、2

D、3

E、5

题型:实验题

下述哪个不参与血红素合成代谢的调节

A.ALA合酶
B.线状四吡咯
C.EPO
D.亚铁螯合酶

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