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【单选题】
异步电动机起动电流大的原因是( )A.
起动时轴上静摩擦阻力转矩
B.
因为起动时φ还未产生，E=0
C.
因为起动时，电动机内阻最小
D.
n2= 0，S= 1>SN，E2 和I2很大
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