问题 实验题

向家坝水电站是金沙江下游梯级发电站开发中的最末一个电站,在大坝修建中要用到大量碎石子.小华随意选取其中一块石子,准备在实验室测定它的密度.

(1)他先将天平放在水平桌面上,移动游码至标尺左端    处,发现指针静止在分度盘中央的右侧,则应将平衡螺母向    调节,直至天平平衡.

(2)用调好的天平测石子的质量,当盘中所加砝码和游码位置如图(甲)所示时,天平平衡,则此石子的质量为    g.在量筒内装有一定量的水,该石子放入前、后的情况如图(乙)所示,则石子的体积是    cm3,此石子的密度是    kg/m3

答案

(1)零刻度线 左 (2)38.4    15      

(1)天平平衡的调节,要放置在水平面上,游码移动到零刻度线处,若不平衡调节平衡螺母。指针右偏说明右边重,螺母向左调。(2)天平的读数分为2部分,砝码20+10=5=35g,游码以左侧边缘对齐的刻度为准,3.4g 所以总共是35+3.4=38.4g。对照乙图,石子放入前体积为30ml,放入后为45ml,从而得出石子体积为45-30=15ml.也就是15 cm3

的调根据密度计算公式

阅读理解

A man died and was on his way to another world, either Heaven ( 天堂 ) or hell ( 地狱 ) . He saw a very beautiful palace half way and the owner of the palace asked him to stay and live in the palace.

The man said, “I have been working hard during my life and now I just want to eat and sleep without any work.”

The owner of the palace said, “If so, there is nowhere else better than here for you. There is enough delicious food in my palace and you can eat whatever you want without anyone stopping you. Moreover, nothing needs to be done by you.” Then, the man stayed in the palace.

At the beginning, the man felt very happy, eating and sleeping, without thinking about other things. But gradually, he felt a bit lonely and bored. So he went to the owner and said, “It is too boring to live by just eating and sleeping every day. Now I have no interest in this kind of life any more. Could you help me find a job?”

The owner replied, “Sorry, there is no job here at all.”

After another several months, the man could not stand his present life and went to the owner again and said, “I really can not stand this sort of life any more. If you do not offer me a job, I would like to go to hell instead of living here.”

The owner of the palace laughed loudly and then said, “Do you think it is Heaven here? It is actually Hell!”

小题1: The man couldn’t stand the present life in the palace because_________.

A.he must eat delicious food everyday

B.had to help others

C.as time went on ,he got bored

D.the owner of the palace was unfriendly小题2: According to the passage, which statements is Right?

A.The beautiful palace the man lived for several months is Heaven.

B.Someone would stop the man ,if he ate more.

C.The man thought he would live in Hell rather than heaven if he couldn’t get a job.

D.In fact, in Heaven the man could eat and sleep without any work.小题3:What’s the title of the passage?

A.A hard-working man

B.Hell and Heaven

C.What you want in Heaven

D.Hell is better than Heaven

名词解释