题目内容

3. Joe paid 75.00 dollars for a computer. (laptop, used)

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4. Margaret wore a dress to the party. (silk, beautiful, long)

5. The new office assistant is a woman. (young, cheerful, Mexican)

复数模为50,辐角主值为50°,与另一个复数模为5,辐角主值为5°相除后是:

A. 模为10,辐角主值为55°
B. 模为10,辐角主值为45°
C. 模为250,辐角主值为55°
D. 模为250,辐角主值为45°

一般电工中,复数的加减法用代数式,复数的乘除法用极坐标式。

A. 对
B. 错