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【简答题】
已知一调速系统的特征方程式为 试用劳斯判据判别系统的稳定性，若不稳定请说明有几个根具有正实部。
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who
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as
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that
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like
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fast enough
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enough fast
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quick enough
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enough quickly
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ran over
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ran down
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A.
who
B.
as
C.
what
D.
like
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A.
ran out of
B.
ran away
C.
ran out
D.
ran off
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