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【单选题】
荧光灯逆变器工作频率在( )以上时,可以提高荧光灯光效,改善管压波形与功率因数。
A.
5kHz
B.
10kHz
C.
15kHz
D.
50kHz
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A.
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B.
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C.
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D.
like, party
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A.
so
B.
and
C.
or
D.
but
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A.
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错误
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A.
/
B.
a
C.
the
D.
an
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