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【单选题】
下 图所示电路中,已知 BJT 的 V BE(on) =0.7V , r bb ′ 可忽略不计,其他电路参数如图中所示且各电容的容量足够大。则可确定 β 分别为 50 、 100 和 150 时电路的 Av分 别为( ) 。A.
97.2，98.3，98.6；
B.
97.2，194.4，291.6；
C.
－97.2，－98.3，－98.6；
D.
－97.2，－194.4，－291.6。
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举一反三
【单选题】退货收货员根据配送员带回来的退货单核对退货名称、数量、规格、保质期等信息，若实际货品与退货单信息不一致，找配送员进行差异处理，并对回单进行确认。此项作业属于( )。
A.
返品验收作业
B.
返品整理作业
C.
良品入库作业
D.
拒收退作业
【简答题】How many books did Carson write before Silent Spring, and what were their titles? ______.
【简答题】阅读短文，根据要求完成下面各小题。 Mr. Smith is a teacher. Yesterday he did a survey of what his students did on their last day off and this is what he learned. Linda went to see her grandparents. Her grandparents liv...
【单选题】What did the writer learn from books as a child?
A.
About many foreign places.
B.
About many historical figures.
C.
About the outside world as well as her own self.
D.
About the ironies of life.
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