题目内容

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

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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

Question 2 What do NASA officials think about the thick clouds?

A. They need to be taken seriously
B. They have a huge effect on fishery
C. They may be affecting the world's climate
D. They might be causing trouble to air flights

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