问题
单项选择题
凸极式同步发电机的电磁功率Pem的最大值出现在功角θ（）的位置。
A.小于90°
B.大于90°
C.等于90°
D.等于0°
答案
参考答案：A
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凸极式同步发电机的电磁功率Pem的最大值出现在功角θ（）的位置。
A.小于90°
B.大于90°
C.等于90°
D.等于0°
参考答案：A
| 完形填空。 | |||
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