题目内容
复数的模可以是负数.
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复数的三角函数形式A=5(cos-36.87 °+jsin--36.87 °)书写正确吗？
复数A=-6-j7的虚部是7.
复数A=j6 的极坐标形式是A=6∠90°
Listen to a dialogue and decode the message by finding out the correct choices in brackets according to what you have heard.[音频]Pat 1(Alice, Alex, Alison) came to see Li Hong. They talked about the party last night and the weather. Pat didn’t go to the party because it was so cold and 2(windy, rainy, snowy) . It seemed that he didn’t like the weather here. When Li Hong suggested a3 (walk, talk, work) in the afternoon, Pat thought it was too cold to go out for it was4(fourteen, thirteen, sixteen) degrees Celsius. Li Hong didn’t agree. She said in winter, the weather could be much colder. Last winter, it was 5(three, six, seven) degrees below zero for three 6 (weeks, days, months) and very windy.
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