题目内容

What does the speaker want to prove by using Abraham Lincoln as an example?

A true hero can choose to do the right things.
B. A true hero is always modest and unselfish.
C. A true hero must have a strong will.
D. A true hero tends to treat others equally.

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Who is used as an example to show that a true hero can influence a large number of people?

A. Benjamin Franklin.
B. Martin Luther King, Jr.
C. George Washington.
D. Thomas Jefferson.

常见的电容精度有:

A. I级±5%
B. II级±10%
C. III级±20%
D. IV级±30%

以下不属于LPWAN技术的是( )。

A. LoRa
B. NB-IoT
C. ZigBee
D. eMTC

关于RS-485与RS-232两种通信方式,下列说法正确的是( )。

A. 都不属于串行总线
B. 都是半双工通信方式
C. 信号都采用差分传输方式
D. 都是异步通信方式

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