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