电路如图所示,已知R1 5k,R215k,R3 10k,RC 2k,RE 2k, 当电阻R2 不慎被短路后, (如图),该电路中的晶体管处于〔 〕。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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