问题 填空题

如图所示的台秤是称量物体质量的工具.使用前,应先将台秤放在水平面上,游码置于零刻度,先调节______使秤杆水平平衡,图示中被称量物体的质量是______kg.

答案

使用前,将台秤放在水平面上,游码置于零刻度,调节调零螺丝使秤杆水平平衡.

秤杆每一个大格代表100g,每一个小格代表50g,游码对应的刻度值是200g=0.2kg.

物体的质量=砝码的质量+游码对应的刻度值=2kg+0.2kg=2.2kg.

故答案为:调零螺丝;2.2.

选择题
单项选择题

There are many kinds of friends. Some are always (1) you, but don’t understand you. Some say only a few words to you, but understand you. Many people will step in your life, but only (2) friends leave footprints.

I shall always recall the autumn and the girl with the (3) . She will always bring back the friendship between us. I know she will always be my best friend.It was the golden season. I could see the yellow leaves (4) with the cool (5) . In such a season, I liked walking alone on the roads covered with leaves, (6) to the sound of them.Autumn is a (7) season and life is uninteresting. The free days always get me (8) . But one day, the sound of a violin (9) into my ears like a stream flowing in the mountains. I was so surprised that I jumped to see what it was. A young girl, standing in the wind, was (10) in playing her violin.

I had (11) seen her before. The music was so nice that I listened quietly. Lost in the music, I didn’t know that I had been (12) there for so long but my existence did not seem to disturb her.Leaves were still falling. Every day she played the violin at the comer of the building (13) I went downstairs to watch her performance. I was the only listener. The autumn seemed no longer lonely and life became (14) . (15) we didn’t know each other, I thought we were already good friends. I believe she also loved me.Autumn was nearly over. One day, when I was listening carefully, the sound suddenly (16) . To my astonishment, the girl came over to me.

"You must like music from the violin." she said."Yes. And you play very well. Why did you stop’." I asked.Suddenly, a (17) expression appeared on her face and I could feel something unusual."I came here to see my grandmother, but now I must leave. I once played very badly. It was your listening every day that (18) me. " she said."In fact, it was your playing (19) gave me a meaningful autumn," I answered, " Let’s be friends. "The girl smiled, and so did I. I never heard her play again in my life. I no longer went downstairs to listen to her. Only thick leaves were left behind. But I will always remember the fine figure of the girl. She is like a (20) —so short, so bright, like a shooting star giving off so much light that makes the autumn beautiful.

 

第(4)空应选择()

A.shaking 

B.hanging 

C.falling 

D.floating