【单选题】There are eight og signals, each of bandwidth B=4kHz. Samples of these signals are time-division-multiplexed, quantized and binary-coded. The step size Δ of the quantizer cannot be greater than 0....
【单选题】Consider a two-country two-good model where labor is the only factor of production . Each country faces an increasing-cost production-possibility curve. In th is model the amount s of both goods that ...
【简答题】A
440-V 50-Hz two-pole Y-connected induction motor is rated at 85 kW.
The equivalent circuit
parameters are R 1 = 0.105 Ω R 2 = 0.065 Ω X m = 7.9 Ω X 1 = 0.17 Ω X 2 = 0.17 Ω P F&W = 1.6 k...
【简答题】Assume that both portfolios A and B are well diversified, that E ( r A ) =12%, and E ( r B ) =9%. If the economy has only one factor, and β(A) =1.2, whereas β(B)=0.8, what must be the risk-free rate?
【单选题】安静时 K + 由细胞内向细胞外的移动属于 ( )
【单选题】For a transmission line supplying a load with a lagging power factor, the sending and receiving end voltages are V_S=11.8 kV and: V_R=11.0 kV. What is the voltage regulation, stated as a percentage?
【多选题】关于生产函数Q=ƒ(L, )的生产的第二阶段应该是( )。
A.
开始于AP L 开始递减处,终止于MP L 为零处
B.
开始于MP L 开始递减处,终止于AP L 为零处
C.
开始于AP L 曲线和MP L 曲线相交处,终止于MP L 曲线和水平轴的相交处
D.
开始于AP L 的最高点,终止于TP L 的最高点
【简答题】A 60-Hz 20-kVA 8000/240-Vrms transformer has the following equivalent-circuit parameters: Primary resistance R 1 = 15Ω Secondary resistance R 2 = 0.02Ω Primary leakage reactance X 1 = 120Ω Secondary l...
【单选题】注意分为内源性和外源性注意。内源性注意是指个体根据自己的目标或意图来分配注意 支配行为,是主动注意;外源性注意是指由个体外部信息引起的个体注意,是被动注意。 根据上述定义,下列属于内源性注意的是:
B.
六一儿童节,公园里奇幻的魔术表演受到许多小朋友和家长[微博]的喜爱
C.
超市琳琅满目的商品,包括各异、颜色鲜亮,吸引了许多顾客的眼球
D.
根据客户的要求,广告设计师特别关注了大量以温馨家园为题材的售楼广告素材
【单选题】关于生产函数Q=ƒ(L. )的生产的第二阶段应该是( )。
A.
开始于AP L 开始递减处,终止于MP L 为零处;
B.
开始于MP L 开始递减处,终止于AP L 为零处;
C.
开始于AP L 曲线和MP L 曲线相交处,终止于MP L 曲线和水平轴的相交处;
D.
开始于AP L 的最高点,终止于TP L 的最高点。