题目内容

A/D转换的过程就是 的过程。

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在A/D转换器中模拟量和数字量是一一对应的关系。

A. 对
B. 错

正弦量与相量之间是( )关系。

A. 相等
B. 相应
C. 没有

复数就是相量,相量就是复数。( )

A. 对
B. 错

Questions 1 to 2 are based on the new report you have just heard.Question 1 What has caused the thick clouds in the photos taken by a NASA satellite?

A. Warm currents in the ocean
B. Ship traffic in the Atlantic
C. Particles emitted by power plants
D. Exhaust from cars in Europe

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