【简答题】如图所示电路 (a) 的伏安特性曲线如图 (b) 所示,试给出网络 N 的戴维南等效电路。
【单选题】酵母菌总数测定宜选取平均菌落数小于多少的稀释级
【单选题】Flingers Inc. reveals the following information in their annual report for FY 2004. What is Flingers' return on assets?
【单选题】For newly established companies, HJS Inc. offers______information services on a range of issues such as service usage, service costs, and customer satisfaction.
【简答题】图示电路中N为含源线性电阻网络,其端口伏安特性曲线如图中所示。当RL调到何值时从网络获得最大功率,求RL获得的最大功率(W)。【图片】
【单选题】某同学利用如图所示的电路描绘小灯泡的伏安特性曲线。在实验中,他将滑动变阻器的滑片从左端匀速滑向右端,发现电流表的指针始终在小角度偏转,而电压表的示数开始时变化很小.但当滑片接近右端时电压表的示数迅速变大。为了便于操作并减小误差,你认为应采取的措施是( )。
A.
换用最大阻值更大的滑动变阻器,将导线a的M端移到电流表“3”接线柱上
B.
换用最大阻值更大的滑动变阻器,将导线b的N端移到电流表“0.6”接线柱上
C.
换用最大阻值更小的滑动变阻器,将导线n的M端移到电流表“3”接线柱上
D.
换用最大阻值更小的滑动变阻器,将导线b的N端移到电流表“0.6”接线柱上
【简答题】A.They are less intelt. B.They are less moral. C.They are more numerous. D.They often speak a non-English language at home.