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【单选题】
交流电压的波形因数Kf定义为( )。
A.
平均值与有效值之比
B.
有效值与平均值之比
C.
峰值与平均值之比
D.
峰值与有效值之比
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B.
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A.
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B.
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C.
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D.
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A.
can’t
B.
may not
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mustn’t
D.
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A.
have they
B.
haven’t they
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didn’t they
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A.
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B.
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【单选题】闭环数控系统中,采样系统的采样周期T应满足(    )。
A.
T>π/ω max
B.
T>2π/ω max
C.
T<π/ω max
D.
T≤π/ω max
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