问题 问答题 简答题

非气象回波指那些回波?

答案

参考答案:

这类回波形成的直接来源是地物、飞机等非气象目标物对电磁波的反射以及由于雷达的性能而引起的虚假回波。但在这类回波中,有些回波的出现也和气象条件有关,如海浪回波的强弱与海面上大风强度有关,超折射间波和大气中逆温层的存在有关。

这类回波包括:地物回波、超折射回波、同波长干扰回波、飞机、船只等的回波、海浪回波、由天线辐射特性造成的虚假回波。

阅读理解

阅读理解。

     I first went to Harrow in the summer term. The school had the biggest swimming pool I had ever

seen. It was a good joke to come up behind a naked boy, and push him into the pool. I made quite

a habit of this with boys of my own size or less.

     One day I saw a boy wrapped in a towel on the side of the pool. He was no bigger than I was,

so I thought him a fair game. Coming secretly behind, I pushed him in, holding on to his towel so that

it would not get wet, I was surprised to see an angry face come out from the water, and a being of

great strength making its way by strokes (猛力地划) to the shore. I fled, but in vain. He overtook me,

seized me violently, and threw me into the deepest part of their pool. I soon climbed out on the other

side, and found myself surrounded by a crowd of younger boys. "Do you know what you have done?"

they said, "It's Amery; he is in Grade Six. He is champion at gym, and he has got his football honor."

     I was frightened and felt ashamed. How could I tell his position when he was wrapped in a bath

towel and so small? He didn't seem pleased at all, so I added in a most brilliant word, "My father, who

is a great man, is also small." He laughed at this, and after some general words about my rude behavior

and how I had better be careful in the future, the incident was closed.

1. The writer thought Amery "a fair game" because the boy _________.

A. looked like an animal

B. was fond of games

C. was of similar size

D. was good at sports

2. The writer was frightened because _________.

A. he was laughed at by other boys

B. Amery turned out to be in the same grade

C. he pushed Amery hard and hurt him

D. he played a joke on an outstanding athlete

3. By saying "My father, who is a great man, is also small", the writer ________.

A. tried to please Amery

B. challenged Amery

C. threatened Amery

D. admired his father

4. Which of the following is TRUE?

A. The writer could run faster than Amery.

B. The writer liked playing on boys of all sizes.

C. Amery was a student in Grade Four.

D. Amery forgave the writer for his rude behavior.

填空题