题目内容

The Shilin Karst boasts numerous odd-shaped stone formations, hence the name of _______.

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The Three Parallel Rivers of Yunnan Protected Areas refer to the areas where the three rivers, namely, ___; _ and _____, flow roughly parallel through steep gorges.

A. the Jinsha Rivei
B. the Lancang River
C. the Nujiang River
D. Weishui River

一个复数的代数式为3-j4，则它的极坐标式是（）。

A. 5∠-37°
B. 5∠53°
C. -5∠37°
D. 5∠-53°

已知复数 A=100∠30°，B=50∠15°，它们的商A/B为

A. 2∠2°
B. 50∠15°
C. 2∠15°
D. 50∠2°

j为虚数的单位，j2=-1，所以当一个复数乘以j时，模不变，幅角（）。

A. 增大90度
B. 减小90度
C. 不变