信号继电器的文字符号是()。 A.KV B.KA C.KM D.KS

题型:单项选择题

问题:

信号继电器的文字符号是()。

A.KV

B.KA

C.KM

D.KS

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题型:单项选择题

阅读理解。

          I started my school life at the age of six. At first the school for me,

a boy, meant play , play and more play instead of sitting in the classroom

and learning   something. However I hanged the way I used to behave at

school with the help  of my teachers. I tried my best to do well in  my

schoolwork and follow the school rules.   

        Growing and learning were great fun. Every year we had different

kinds of  school trips. Not only could we learn many things f'rom them,

but also we were  given many projects as homework. It helped us know

more. At the same time,we made many good friends. In Grade 8,I won

prizes in drawing and English speech competitions. When I was in Grade

9,I realized that l should give all my attention to studying to get into senior

middle school.   

    Whenever I think of my school life,I feel very happy and I think in

everybody's school life there are many ups and downs that influence his

life. School is a place where all of us learn to care and share."School" 

 is not just a place,but a large building made up of rules, knowledge and

love.I think in everybody's success,    school plays a key(关键)role.I can

describe my school in "Three Ss". They   are: Small, Sweet and Simple.

My school was the best and will always be the best.

1.When did the writer start to go to school? 

                                                          

2.Who helped the writer change the way he used to behave at school?

                                                          

3.What does the writer think of the school trips?

                                                          

4.What does the writer think plays a key role in everybody's success?

                                                          

5.The writer describes his school in"Three Ss". What are they?

                                                          

题型:单项选择题

关于尘肺,下列知识哪项不对()

A.不规则小阴影,见于非典型矽肺

B.胸膜斑,矽肺主要影像之一

C.长条形大阴影,见于典型矽肺

D.类圆形小阴影,矽肺最常见征象之一

E.不规则小阴影,见于石棉肺、不典型矽肺和其他尘肺

题型:单项选择题

行道树的最小布置宽度一般为( )m。

A.0.5

B.1.0

C.1.5

D.2.0

题型:单项选择题

下列哪一项最好地描述了模拟信号( )

A.用图表示像是一个正弦波

B.有两个不同的状态

C.一每秒周期数计量

D.A和C

题型:单项选择题

属于骨折早期并发症的是()

A.损伤性骨化

B.急性骨萎缩

C.脂肪栓塞

D.关节僵直

E.坠积性肺炎

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