单项选择题
A.2~20 B.8~150 C.10~1000
A.80MΩ B.200MΩ C.300MΩ D.400MΩ
A.电磁力矩大于阻力矩 B.阻力矩大于电磁力矩 C.电磁力矩等于阻力矩
A.0.1～0.3 B.0.2～0.4 C.0.3～0.5
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