问题
单项选择题
当水准仪架设在两立尺点中间与架设一侧时，所测高差不相等，说明水准仪（）。
A.圆水准器轴不平行于仪器竖轴
B.十字丝的横丝不垂直于仪器竖轴
C.水准管轴不平行于视准轴
D.存在视差
答案
参考答案：C
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当水准仪架设在两立尺点中间与架设一侧时，所测高差不相等，说明水准仪（）。
A.圆水准器轴不平行于仪器竖轴
B.十字丝的横丝不垂直于仪器竖轴
C.水准管轴不平行于视准轴
D.存在视差
参考答案：C
When I was 16 years old, a boy gave me an important gift. It was a . It was the early autumn of my first year at a middle school, and my old school was far away. a result, no one knew who I was. I was very , and afraid to make friends with anyone. Every time I the other students talking and laughing, I felt my heart . I couldn’t talk to anyone about my problems. And I didn’t want my parents to me. Then one day, my classmates talked with their friends, but I sat at my desk unhappily as usual. , a boy came into the classroom. I didn’t know he was. He passed me and then turned back. He me, without a word, but a smile. , I felt the touch of something bright and friendly. It made me feel happy and . That smile changed my life. I started to talk with other students and made friends. Day by day, I became to everyone in my class. The boy with the lucky smile has become my best friend now. One day I asked him why he smiled, but he couldn’t remember at me! I have been happy every day all the dark days have gone. I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and smiles will come back to you.
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