《谏逐客书》中先列举穆公、孝公、惠王、昭王广招人才的历史事实,然后得出“此四君者,皆以客之功”的结论,所采用的论证方法是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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