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【单选题】
某三相异步电动机额定转速为1460rpm,当负载转矩为额定转矩的一半时,其转速为
A.
1500rpm
B.
1480rpm
C.
1440rpm
D.
1460rpm
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A.
战国
B.
东汉
C.
三国两晋南北朝
D.
五代
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B.
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