本机振荡器产生一个比发射机发射频率高或低一个中频的高频电压信号。

题型:判断题

问题:

本机振荡器产生一个比发射机发射频率高或低一个中频的高频电压信号。

考点:民用航空气象人员考试雷达原理雷达原理题库
题型:判断题

阅读短文,判断正(√)误(×)。

      My name is Jenny. I am a school girl. I am ten years old. I'm tall and thin. I have a beautiful bag. It is blue.

I like my bag. This is my English teacher. He is Mr. Brown. He has got a black bicycle. He goes to school by

bicycle. I have got a good friend in the school. He is Jack.

( ) 1. Jenny is a girl.

( ) 2. Jenny is not short.

( ) 3. Jenny has a blue bag.

( ) 4. Mr. Brown is Jenny's father.

( ) 5. Mr. Brown goes to school by bus.

( ) 6. Jenny's good friend is Jack.

题型:判断题

在海边观察远处驶来的轮船,会出现如图中①至③所示的现象.这种现象反映的地理事实是(  )

A.地球绕太阳公转

B.地球自西向东自转

C.地球是个球体

D.海平面上升

题型:判断题

X线平片上可见部分骨小梁与压力方向一致,部分与张力方向一致者为()

A.股骨干

B.股骨近端

C.肱骨干

D.胫骨近端

E.髂骨

题型:判断题

以下可由总队实施的奖励有()。

A.嘉奖总队培训基地

B.某消防大队记集体三等功

C.嘉奖某消防大队

D.总队防火监督部正连职参谋赵某记个人二等功

题型:判断题

为传输层提供了简单、不可靠的信息传输服务是()

A.FTP

B.TCP

C.UDP

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