根据调制信号控制载波的不同,调制可分为()、频率调制和相位调制。

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问题:

根据调制信号控制载波的不同,调制可分为()、频率调制和相位调制。

考点:通信电子计算机技能考试无线电调试工(高级)无线电调试工(高级)题库
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Expressing gratitude is an important form of good manners. Nowadays more and more people in China have found it’s high time to (1) a thankful heart for the young.Everyone likes to get praised and appreciated. Gratitude is the greatest of virtues, which lets others smile and makes the world more beautiful. You just need several minutes to write down a thank-you note, but it brings much joy to the (2) .We live in a society where we enjoy the different services of others. But (3) of them should be taken for granted.Gratitude is also a kind of (4) in life. In developing gratitude for every moment—for the simple joys and even for the (5) times—we come to truly enjoy and appreciate life. Then we are able to see the (6) that surrounds us.Try to write a thank-you letter to your parents for working hard to (7) you a happy life.Be grateful to your teachers because of their (8) with your studies and character building.Say thanks to your friends who (9) both your happiness and sorrow. We are sure it will bring them much joy and add (10) into your own life as well.

第(8)空应选择()

A.study

B.part

C.help

D.cooperation

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下列含木质素类成分的药材有:()

A.厚朴

B.五味子

C.黄柏

D.五倍子

E.肉桂

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FBZL-16型轮胎式防爆装载机行车制动系统(脚制动系统)为气顶油钳盘式,它由()的管路等组成。

A、空压泵

B、储气筒

C、制动总泵

D、制动器

E、以上都是

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秦艽抗炎的主要有效成分是()

A.挥发油

B.糖类

C.东莨菪碱

D.粉防己碱

E.秦艽碱甲

题型:填空题

固定式地脚螺栓的有()、()、()。

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