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
Question 3 For what purpose did this staff at a supermarket in Melbourne sign a letter?
A. To appeal for higher wages
B. To demand better health care
C. To dismiss the bad-tempered supervisor
D. To call for a permanent security guard
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