一台磁路不饱和的四极它励直流发电机,P N =11千瓦,U N =230伏,n N =1450转/分。电枢绕组为,总导体数N=620根,电枢回路总电阻(包括电刷接触电阻)为0.38欧,求: ⑴满载运行时的每极磁通和电磁转矩; ⑵如果负载电阻、转速及励磁电流保持不变,将电刷向某个方向移动后,负载电流增加了10%,问此时磁通如何变化?原因是什么?改变后的数值是多少?
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【单选题】By using the example of Galileo, the author intends to reveal that
A.
objectivity is essential to scientific research.
B.
hypothesis is based on careful observation.
C.
creativeness plays an important part in scientific research.
D.
observation is the only factor determining scientific research.