小明做“测定小灯泡的电功率”实验时,所用器材有2节干电池、额定电压为2.5V的小

题型:问答题

问题:

小明做“测定小灯泡的电功率”实验时,所用器材有2节干电池、额定电压为2.5V的小灯泡、滑动变阻器、电表、开关和导线.如图甲是小明没有连接完的实物电路.

(1)请你用笔画线代替导线,将缺少的两根导线接好.

(2)若小明连好电路闭合开关,发现小灯泡不亮,但电流表有示数.接下来应进行的操作______.

A.更换开关              B.更换小灯泡

C.检查电路是否断路      D.移动滑动变阻器滑片,观察小灯泡是否发光

(3)实验中移动滑片P使小灯泡正常发光,电流表示数如图乙所示,则小灯泡的额定电流为______A,额定功率为______W.

(4)小明在实验时使用了旧电池,实验中发现,即使不移动滑片,灯泡的亮度也逐渐变暗.小明猜想:“灯泡逐渐变暗是因为电池输出电压变小了”,请设计一简单的实验帮助小明检验他的猜想.

①主要器材:旧电池、导线、灯泡、______;

②简要做法:______.

考点:测量电功率的实验
题型:问答题

《土地管理法》对农用地转为建设用地实行()级审批制度。

A.一

B.二

C.三

D.四

题型:问答题

依据关于贯彻落实《中 * * 国务院关于加快水利改革发展的决定》加强水利安全生产工作的实施意见,对隐患整改不力造成事故的,以及()事故的,严肃行政问责和追究相关有关领导及责任人的责任。

A.漏报

B.迟报

C.谎报

D.瞒报

题型:问答题

阅读理解。

                                                Young Inventors' Latest Concepts

     Students across China, studying in the fields of engineering, science and technology, are developing a

range of inventions that they hope will one day be marketable. Here are three examples from the minds of China's young inventors.

     Foot-Controlled Mouse

     This new kind of mouse is controlled by the feet instead of the hands, to help handicapped people

when surfing the Internet.

     The new device is called a "surf mouse", and looks like a pair of blue slippers. When users press the

slippers with their forefeet, they are clicking the left mouse button; when people press with their heels,

they are clicking the right mouse; when they roll their feet over the slippers, they can view Web pages.

      Dirty Water Filter

     The "pump of life", a filter, can make dirty water drinkable. The pump is over 30 centimeters long and

has a diameter of four centimeters. It has an in-pipe at the top and out-pipe at the end. There are two

main parts: the drive zone to pump water and the material zone to eliminate (去除) harmful substances.

Rain, fish tank water and coalmine water can all be cleaned in the material zone. The invention could be

used for many kinds of disaster relief. Pan told us that water was delivered by helicopters to Wenchuan.

If they had sent water-purifying equipment instead, people could have had more water faster after the

earthquake.

     Transformer Vehicle

     The multi-functional vehicle is named Tranfus. By changing the breadth of tires and the structure of a

car, it can become a motorbike or a luggage carrier. The name Tranfus is a contraction of "transforming

for us."

      Traffic jams can make a driver go crazy. The Tranfus can change into luggage carrier, and users

could walk with it. When started, the roof transforms, turning into a motorbike. But its inventor doesn't

think Tranfus will be on the market soon as some auto companies like it, but none are willing to invest.

1. Who will be most likely to use the Foot-Controlled Mouse?

A. Those who are left-handed.

B. Those absent-minded in classes.

C. Those hoping cheating in exams.

D. Those having disability in hands.

2。 How can users look through Web pages with the Foot-Controlled Mouse?

A. They can force down their forefeet.

B. They can raise their heels.

C. They can roll their feet.

D. They can press their heels.

3. When should Dirty Water Filter be most likely useful?

A. When there is a lack of water because of drought.

B. When there are natural disasters causing clean water shortage.

C. When there are earthquakes in the mountainous areas.

D. When there are too many people in a crowded city.

4. Why CAN'T the Transformer Vehicle be on the market soon?

A. It is only a crazy idea and has no scientifictheory to support it.

B. It is too small to be a car and too big to be a luggage carrier.

C. There are no auto companies offering to invest in it.

D. There are no auto companies showing interest in it.

题型:问答题

桂枝汤中体现"调和营卫"的主要配伍药对是()

A.桂枝与甘草

B.芍药与甘草

C.桂枝与芍药

D.芍药与大枣

E.桂枝与生姜

题型:问答题

洗涤沉淀所使用的洗涤剂应是()。

A、蒸馏水

B、沉淀剂的稀溶液

C、热的洗涤液

D、视沉淀性质而选择洗涤剂

更多题库