欧洲核子研究中心2011年9月23日宣布，他们发现一些中微子可能以_爱下问搜题

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问题填空题

欧洲核子研究中心2011年9月23日宣布，他们发现一些中微子可能以快于光速的速度飞行．这些中微子运动730km，比光运动这么长的距离快了60ns．1ns=10^-9 s，

1

1-x

≈1+x，当x＜＜1时．如果他们的可靠，则这些中微子的速度比光速大______m/s．（已知光速大小为3×10⁸m/s）

答案

光运动730km的时间t₁=

730×103

3×108

=2.4333333×10^-3s，

而中微子运动730km的时间t₂=

730×103

v

=2.4333333×10^-3-6×10^-8=243333.3×10^-8-6×10^-8=243327.3×10^-8s

解得v=300007.4×10³m/s，

故有v-c=300007.4×10³m/s，-300000×10³=7.4×10³m/s

故本题的答案为：7.4×10³．

完形填空

It was the middle of my third grade, and I always lied for no reason about many things. Later, I realized that I was labeled(标签为) a liar, and my parents did not_____ me. Therefore, I promised to_____telling lies.
A few days later, my sister and I were invited to spend the weekend with my aunt. On that day, someone took one of Aunt Kim’s erasers and_____it across the top of the TV. The eraser ruined the shiny_____of the TV. When Aunt Kim discovered the destrction, all three of us were called into the TV room and asked to tell the____. Nobody did! The next thing I knew was that she was on the phone with my parents and they were on their way to____ me up.
It must be me! I was the_____. I was taken home and sent to my room. I begged them to believe that I was innocent, but no one______.
I stayed in my room the rest of that day. My parents_____let me out for dinner. And then there was a knock at the front door. Aunt Kim was standing there. It turned out that my younger sister finally felt_____! She_____that she was the one who rubbed the eraser on the TV. Aunt Kim had come to get me. I was invited back!
I don’t even remember being_____at my sister. I learned a valuable lesson about lying. A liar is not believed when he tells the truth.No matter how big or_____your lie is, once you are labeled a liar, _____trust takes a lot of work and time. I promised myself right then_____to lie again.

D．immediately

单项选择题

钢筋混凝土井塔爬模施工法的特点是（）。

A．起重机吊装工作量大

B．施工精度高、质量好

C．因分层施工而结构整体性差

D．爬升时无需支承杆