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【单选题】
交流测速发电机有空心杯转子异步测速发电机、笼型转子异步测速发电机和同步测速发电机三种,目前应用最为广泛的是( )。
A.
同步测速发电机
B.
笼型转子异步测速发电机
C.
空心杯转子异步测速发电机
D.
同步测速发电机和笼型转子异步测速发电机
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